Adapt the MS-DOS build to changes in gnulib.

Adapt the MS-DOS build to changes in gnulib.

 msdos/sedlibmk.inp: Update checklist.
 (am_libgnu_a_OBJECTS): Remove careadlinkat.$(OBJEXT).
 ($(top_builddir)/config.status): Edit away, both as target and in
 prerequisites.
 (@am__fastdepCC_FALSE@): Fix editing.
 (@GL_GENERATE_STDBOOL_H_TRUE@, @GL_GENERATE_STDBOOL_H_FALSE@)
 (@GL_GENERATE_STDDEF_H_TRUE@, @GL_GENERATE_STDDEF_H_FALSE@)
 (@GL_GENERATE_STDINT_H_TRUE@, @GL_GENERATE_STDINT_H_FALSE@): Edit
 to either nothing or "#".
 src/msdos.c (careadlinkat, careadlinkatcwd): MS-DOS replacements.