Adapt the MSDOS build to changes in revno 104021.

 msdos/inttypes.h: New file.
 msdos/sed2v2.inp (HAVE_DECL_STRTOULL, HAVE_DECL_STRTOUMAX)
 (HAVE_STRTOULL, HAVE_STRTOULL): Define to 1.
 msdos/sedlibmk.inp (BUILT_SOURCES): Edit out inttypes.h.
 msdos/sed1v2.inp (CPPFLAGS): Edit to "-I../msdos".
 Add ../msdos/inttypes.h to prerequisites of lread.o.
 src/dosfns.c (Fint86, Fdos_memget, Fdos_memput): Use `ASIZE (FOO)'
 rather than `XVECTOR (FOO)->size'.