Avoid DoS vulnerability through unsafe default assignment.

See https://www.shellcheck.net/wiki/SC2223 .

* MODULES.html.sh (func_tmpdir): Surround default assignment with
double-quotes.
* build-aux/bootstrap: Likewise.
* build-aux/csharpcomp.sh.in (func_tmpdir): Likewise.
* build-aux/gendocs.sh: Likewise.
* build-aux/libtool-next-version (func_tmpdir): Likewise.
* config/srclist-update: Likewise.
* gnulib-tool (func_tmpdir): Likewise.
* posix-modules (func_tmpdir): Likewise.
* tests/test-atexit.sh: Likewise.
* tests/test-btoc32-1.sh: Likewise.
* tests/test-btoc32-2.sh: Likewise.
* tests/test-btowc1.sh: Likewise.
* tests/test-btowc2.sh: Likewise.
* tests/test-c-dtoastr.sh: Likewise.
* tests/test-c-ldtoastr.sh: Likewise.
* tests/test-c-snprintf.sh: Likewise.
* tests/test-c-strcase.sh: Likewise.
* tests/test-c-vasprintf.sh: Likewise.
* tests/test-c-vsnprintf.sh: Likewise.
* tests/test-c-xvasprintf.sh: Likewise.
* tests/test-c32isalnum.sh: Likewise.
* tests/test-c32isalpha.sh: Likewise.
* tests/test-c32isblank.sh: Likewise.
* tests/test-c32iscntrl.sh: Likewise.
* tests/test-c32isdigit.sh: Likewise.
* tests/test-c32isgraph.sh: Likewise.
* tests/test-c32islower.sh: Likewise.
* tests/test-c32isprint.sh: Likewise.
* tests/test-c32ispunct.sh: Likewise.
* tests/test-c32isspace.sh: Likewise.
* tests/test-c32isupper.sh: Likewise.
* tests/test-c32isxdigit.sh: Likewise.
* tests/test-c32rtomb.sh: Likewise.
* tests/test-c32snrtombs-1.sh: Likewise.
* tests/test-c32snrtombs-2.sh: Likewise.
* tests/test-c32snrtombs-3.sh: Likewise.
* tests/test-c32snrtombs-4.sh: Likewise.
* tests/test-c32srtombs-1.sh: Likewise.
* tests/test-c32srtombs-2.sh: Likewise.
* tests/test-c32srtombs-3.sh: Likewise.
* tests/test-c32srtombs-4.sh: Likewise.
* tests/test-c32stombs-1.sh: Likewise.
* tests/test-c32stombs-2.sh: Likewise.
* tests/test-c32stombs-3.sh: Likewise.
* tests/test-c32stombs-4.sh: Likewise.
* tests/test-closein.sh: Likewise.
* tests/test-copy-acl.sh (func_tmpdir): Likewise.
* tests/test-copy-file.sh (func_tmpdir): Likewise.
* tests/test-dprintf-posix.sh: Likewise.
* tests/test-execl.sh: Likewise.
* tests/test-execle.sh: Likewise.
* tests/test-execlp.sh: Likewise.
* tests/test-execv.sh: Likewise.
* tests/test-execve.sh: Likewise.
* tests/test-execvp.sh: Likewise.
* tests/test-execvpe.sh: Likewise.
* tests/test-file-has-acl.sh (func_tmpdir): Likewise.
* tests/test-fprintf-posix.sh: Likewise.
* tests/test-init.sh: Likewise.
* tests/test-iswdigit.sh: Likewise.
* tests/test-iswxdigit.sh: Likewise.
* tests/test-mbmemcasecmp1.sh: Likewise.
* tests/test-mbmemcasecmp2.sh: Likewise.
* tests/test-mbmemcasecmp3.sh: Likewise.
* tests/test-mbmemcasecoll1.sh: Likewise.
* tests/test-mbmemcasecoll2.sh: Likewise.
* tests/test-mbmemcasecoll3.sh: Likewise.
* tests/test-mbrtoc32-1.sh: Likewise.
* tests/test-mbrtoc32-2.sh: Likewise.
* tests/test-mbrtoc32-3.sh: Likewise.
* tests/test-mbrtoc32-4.sh: Likewise.
* tests/test-mbrtowc1.sh: Likewise.
* tests/test-mbrtowc2.sh: Likewise.
* tests/test-mbrtowc3.sh: Likewise.
* tests/test-mbrtowc4.sh: Likewise.
* tests/test-mbscasecmp.sh: Likewise.
* tests/test-mbscasestr2.sh: Likewise.
* tests/test-mbscasestr3.sh: Likewise.
* tests/test-mbscasestr4.sh: Likewise.
* tests/test-mbschr.sh: Likewise.
* tests/test-mbscspn.sh: Likewise.
* tests/test-mbsinit.sh: Likewise.
* tests/test-mbsncasecmp.sh: Likewise.
* tests/test-mbsnrtoc32s-1.sh: Likewise.
* tests/test-mbsnrtoc32s-2.sh: Likewise.
* tests/test-mbsnrtoc32s-3.sh: Likewise.
* tests/test-mbsnrtoc32s-4.sh: Likewise.
* tests/test-mbsnrtowcs1.sh: Likewise.
* tests/test-mbsnrtowcs2.sh: Likewise.
* tests/test-mbsnrtowcs3.sh: Likewise.
* tests/test-mbsnrtowcs4.sh: Likewise.
* tests/test-mbspbrk.sh: Likewise.
* tests/test-mbspcasecmp.sh: Likewise.
* tests/test-mbsrchr.sh: Likewise.
* tests/test-mbsrtoc32s-1.sh: Likewise.
* tests/test-mbsrtoc32s-2.sh: Likewise.
* tests/test-mbsrtoc32s-3.sh: Likewise.
* tests/test-mbsrtoc32s-4.sh: Likewise.
* tests/test-mbsrtowcs1.sh: Likewise.
* tests/test-mbsrtowcs2.sh: Likewise.
* tests/test-mbsrtowcs3.sh: Likewise.
* tests/test-mbsrtowcs4.sh: Likewise.
* tests/test-mbsspn.sh: Likewise.
* tests/test-mbsstr2.sh: Likewise.
* tests/test-mbsstr3.sh: Likewise.
* tests/test-mbstoc32s-1.sh: Likewise.
* tests/test-mbstoc32s-2.sh: Likewise.
* tests/test-mbstoc32s-3.sh: Likewise.
* tests/test-mbstoc32s-4.sh: Likewise.
* tests/test-nl_langinfo.sh: Likewise.
* tests/test-parse-duration.sh (func_tmpdir): Likewise.
* tests/test-perror.sh: Likewise.
* tests/test-printf-posix.sh: Likewise.
* tests/test-set-mode-acl.sh (func_tmpdir): Likewise.
* tests/test-setlocale1.sh: Likewise.
* tests/test-strtod1.sh: Likewise.
* tests/test-strtold1.sh: Likewise.
* tests/test-unicodeio2.sh: Likewise.
* tests/test-unicodeio3.sh: Likewise.
* tests/test-vasnprintf-posix2.sh: Likewise.
* tests/test-vc-list-files-cvs.sh: Likewise.
* tests/test-vc-list-files-git.sh: Likewise.
* tests/test-vdprintf-posix.sh: Likewise.
* tests/test-vfprintf-posix.sh: Likewise.
* tests/test-vprintf-posix.sh: Likewise.
* tests/test-wcrtomb.sh: Likewise.
* tests/test-wcsnrtombs1.sh: Likewise.
* tests/test-wcsnrtombs2.sh: Likewise.
* tests/test-wcsnrtombs3.sh: Likewise.
* tests/test-wcsnrtombs4.sh: Likewise.
* tests/test-wcsrtombs1.sh: Likewise.
* tests/test-wcsrtombs2.sh: Likewise.
* tests/test-wcsrtombs3.sh: Likewise.
* tests/test-wcsrtombs4.sh: Likewise.
* tests/test-xprintf-posix.sh: Likewise.
* tests/test-xstrtoimax.sh: Likewise.
* tests/test-xstrtol.sh: Likewise.
* tests/test-xstrtoll.sh: Likewise.
* tests/test-xstrtoumax.sh: Likewise.
* tests/test-yesno.sh: Likewise.
* tests/unicase/test-locale-language.sh: Likewise.
* tests/unicase/test-ulc-casecmp1.sh: Likewise.
* tests/unicase/test-ulc-casecmp2.sh: Likewise.
* tests/unicase/test-ulc-casecoll1.sh: Likewise.
* tests/unicase/test-ulc-casecoll2.sh: Likewise.
* tests/unigbrk/test-ulc-grapheme-breaks.sh: Likewise.
* tests/unistdio/test-u16-vasnprintf2.sh: Likewise.
* tests/unistdio/test-u16-vasnprintf3.sh: Likewise.
* tests/unistdio/test-u32-vasnprintf2.sh: Likewise.
* tests/unistdio/test-u32-vasnprintf3.sh: Likewise.
* tests/unistdio/test-u8-vasnprintf2.sh: Likewise.
* tests/unistdio/test-u8-vasnprintf3.sh: Likewise.
* tests/unistdio/test-ulc-vasnprintf2.sh: Likewise.
* tests/unistdio/test-ulc-vasnprintf3.sh: Likewise.
* tests/uniwbrk/test-ulc-wordbreaks.sh: Likewise.
* tests/uniwidth/test-uc_width2.sh: Likewise.

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