Adapt the MS-DOS build to latest changes.

Adapt the MS-DOS build to latest changes.

 src/callproc.c (call_process_cleanup): Don't close and unlink the
 temporary file if Fcall_process didn't create it in the first
 place.
 (Fcall_process): Don't create tempfile if stdout of the child
 process will be redirected to a file specified with `:file'.
 Don't try to re-open tempfile in that case, and set fd[0] to -1 as
 cue to call_process_cleanup not to close that handle.
 msdos/inttypes.h: Include stdint.h.
 (uintmax_t): Don't define, it is defined in stdint.h.
 msdos/sedlibmk.inp (am__append_1): Edit to comment out.
 (am__append_2): Edit to expose.
 (NEXT_AS_FIRST_DIRECTIVE_STDARG_H, NEXT_STDARG_H, STDARG_H): Edit
 to empty.
 (@GL_GENERATE_STDARG_H_TRUE@, @GL_GENERATE_STDARG_H_FALSE@): Edit
 to comment out corresponding lines.