oldfind: remove

The FTS-based find is the default for a long time; oldfind has not been
installed since 4.5.18 (2015), and was only just used in tests.

* NEWS: Document the change.
* doc/find-maint.texi (Factor Out Repeated Code): Remove mentioning of
oldfind.
* find/.gitignore (/oldfind): Remove entry.
* find/Makefile.am (check_PROGRAMS): Remove.
(oldfind_SOURCES): Remove.
* find/defs.h (struct dir_id): Remove, it was only used in oldfind.c.
(symlink_handling): Likewise.
Adjust comments wrt oldfind otherwise.
* find/oldfind.c: Remove.
* find/testsuite/config/unix.exp: Remove the code to search for and
to run tests with oldfind.
* find/testsuite/find.posix/dotdotfiles.exp: Adjust comment.
* po/POTFILES.in (find/oldfind.c): Remove entry.
* tests/find/debug-missing-arg.sh: Remove run with oldfind.
* tests/find/exec-plus-last-file.sh: Likewise.
* tests/find/execdir-fd-leak.sh: Likewise.
* tests/find/many-dir-entries-vs-OOM.sh: Likewise.
* tests/find/name-lbracket-literal.sh: Likewise.
* tests/find/printf_escape_c.sh: Likewise.
* tests/find/printf_escapechars.sh: Likewise.
* tests/find/printf_inode.sh: Likewise.
* tests/find/refuse-noop.sh: Likewise.
* tests/find/type_list.sh: Likewise.
* tests/local.mk (built_programs): Remove oldfind from list.

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