Make scripts like nroff.sh and neqn.sh portable across various

(Unix-like) shell implementations from Cygwin, MSYS, etc., which use
non-POSIX path separators.  The idea is to extend those scripts to
decide at run-time (of the script) which path separator to use.

* arch/misc/Makefile.sub: New file.
* arch/misc/shdeps.sh: New file, generating OS dependency fixups.
This script handles @GROFF_BIN_PATH_SETUP@, replacing it with
a proper definition of the variable `GROFF_RUNTIME'.

* Makefile.in (SH_DEPS_SED_SCRIPT): New variable.
(MDEFINES): Add SH_DEPS_SED_SCRIPT.
(PROGDEPDIRS): New variable.
`FORCE' it.
(PROGDIRS): Add PROGDEPDIRS.

* src/preproc/eqn/Makefile.sub (neqn): Call SH_DEPS_SED_SCRIPT.
Don't substitute @SEP@ and @BINDIR@.
* src/preproc/eqn/neqn.sh: Use @GROFF_BIN_PATH_SETUP@.
(PATH): Use GROFF_RUNTIME.

* src/roff/nroff/Makefile.sub (nroff): Call SH_DEPS_SED_SCRIPT.
Don't substitute @SEP@ and @BINDIR@.
* src/roff/nroff/nroff.sh: Use @GROFF_BIN_PATH_SETUP@.
(PATH): Use GROFF_RUNTIME.

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