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* msdos/sed2v2.inp (MSDOS, DOS_NT, FLOAT_CHECK_DOMAIN)
(HAVE_INVERSE_HYPERBOLIC, DEVICE_SEP, IS_DIRECTORY_SEP, IS_ANY_SEP)
(INTERNAL_TERMINAL, NULL_DEVICE, SEPCHAR, USER_FULL_NAME)
(_setjmp, _longjmp): Move here from src/s/msdos.h.
(config_opsysfile, config_machfile): Remove.
* msdos/sed1v2.inp (M_FILE, S_FILE): Remove.
* msdos/mainmake.v2 (TAGS tags): Remove src/s/msdos.h.

* src/s/msdos.h: Remove file.
* src/conf_post.h [MSDOS]: New section, moved from s/msdos.h.
* src/Makefile.in (S_FILE): Remove.
(config_h): Remove S_FILE.

* src/conf_post.h (config_opsysfile):
Move earlier, so that WINDOWSNT is available.
(alloca.h) [WINDOWSNT]: Don't include it on MS Windows.

This is a belt-and-braces approach.

* configure.ac: Related comment.

* configure.ac (AMPERSAND_FULL_NAME, subprocesses): Move here from conf_post.h.

* src/conf_post.h (AMPERSAND_FULL_NAME, subprocesses): Move to configure.ac.

* configure.ac (USG5_4): Reintroduce this.
(opsysfile): Set to empty on irix6-5, sol2*, and unixware.

* src/conf_post.h [USG5_4]: Move remaining contents of s/usg5-4-common.h here.
* src/s/usg5-4-common.h: Remove file.

* configure.ac (opsysfile): Set to s/usg5-4-common.h on irix6-5.

* src/conf_post.h [IRIX6_5]: Move remaining contents of s/irix6-5.h here.

* src/s/irix6-5.h: Remove file.

* configure.ac (opsysfile): Set to empty on darwin.

* src/conf_post.h [DARWIN_OS]: Move remaining contents of src/s/darwin.h here.

* src/s/darwin.h: Remove file.

* configure.ac (opsysfile): Set to empty on hpux*.

* src/conf_post.h [HPUX]: Move random, srandom here from s/hpux10-20.h.

* src/s/hpux10-20.h: Remove file, which is now empty.

* configure.ac (AH_BOTTOM): Use an include file, so that the
contents do not get processed by autoheader.  Eg this prevents undefs
being commented out, and is the recommended technique from the
autoconf manual.

* src/conf_post.h: New, split from configure.ac's AH_BOTTOM.

* src/Makefile.in (config_h): Add conf_post.h.
* src/makefile.w32-in (CONFIG_H): Add conf_post.h.