Adapt and fix the MS-DOS port due to gnulib imports.

Adapt and fix the MS-DOS port due to gnulib imports.

 msdos/depfiles.bat: New file.
 msdos/sedlibmk.inp: New file.
 msdos/sedlibcf.inp: New file.
 msdos/sedleim.inp (RUN_EMACS): Rename from RUN-EMACS.
 (BUILT_EMACS): Rename from BUILT-EMACS.
 msdos/sed6.inp (MAKEINFO): Edit to "makeinfo".
 (ENVADD): Adjust to MAKEINFO_OPTS.
 (texinputdir): Don't edit.
 msdos/sed3v2.inp (-DVERSION): Edit out.
 (LOADLIBES): Don't edit to empty.
 msdos/sed2v2.inp: Remove workaround for the "#if ! HAVE_MKTIME ||
 BROKEN_MKTIME" stuff -- it's no longer in src/config.in.
 (HAVE_ATTRIBUTE_ALIGNED, HAVE_C99_STRTOLD, HAVE_DECL_GETENV)
 (HAVE__BOOL): Edit to 1.
 (VERSION, inline, restrict): Edit for DJGPP.
 (my_strftime): Edit to nstrftime.
 msdos/sed1v2.inp (NS_OBJC_OBJ): Edit to empty.
 (@true): Edit to "@rem".
 (move-if-change): Edit to "update".
 (echo): Edit to "djecho".
 (cd $(lib) && ...): Edit to "$(MAKE) -C ...".
 (LIBOBJS): Edit to empty.
 ($(libsrc)/make-docfile): Two new edits, one each for every
 invocation of make-docfile.
 (move-if-change): Fix edit.
 Remove some unused switches from $(ALL_CFLAGS), to make the GCC
 command line shorter.
 msdos/mainmake.v2 (version): Remove, no longer needed (config.in
 defines VERSION).
 (all): Add lib.
 (lib): New target and recipe.
 (lib-src): Depend on lib.
 (src): Depend on lib and lib-src.
 (clean, mostlyclean, distclean, maintainer-clean, extraclean)
 (bootstrap-clean): Recurse into lib.
 (lib, lib-src, src): Specify "all" as an explicit target.
 .bzrignore: Ignore cxxdefs.h and lib/*.in-h files.
 Add lib/deps/.
 config.bat: Configure in `lib'.
 Generate *.Po files in lib/deps.
 src/termcap.c (tputs): Don't declare baud_rate.
 src/s/msdos.h (strtold): Define to _strtold.