Finish fixing the MS-DOS build. Everything builds and works.

Finish fixing the MS-DOS build.  Everything builds and works.

 src/termcap.c (tputs): Don't declare baud_rate.
 msdos/sedlibmk.inp (gl_LIBOBJS): Add getloadavg.o.
 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/sed2v2.inp (my_strftime): Edit to nstrftime.
 msdos/sed1v2.inp (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.