Fix the MSDOS build.

Fix the MSDOS build.

 msdos/mainmake.v2 (boot): Condition the value on the existence of
 autogen/README, not admin/admin.el, since the latter is now part
 of the release tarball.
 (install): Don't copy lib-src/fns.el, as that file is no longer
 generated in that directory.
 msdos/sed1v2.inp (LIB_PTHREAD, LIB_PTHREAD_SIGMASK): Edit to empty.
 (SETTINGS_CFLAGS, SETTINGS_LIBS): Edit these instead of
 GCONF_CFLAGS and GCONF_LIBS.
 msdos/sedlibmk.inp (ALLOCA_H, AR, ARFLAGS, GNULIB_CHDIR, GNULIB_DUP)
 (GNULIB_FDATASYNC, GNULIB_FDOPEN, GNULIB_FSTAT, GNULIB_PCLOSE)
 (GNULIB_PTHREAD_SIGMASK, GNULIB_RAISE, GNULIB_SIGACTION)
 (GNULIB_SIGPROCMASK, GNULIB_SIGNAL_H_SIGPIPE, HAVE_FDATASYNC)
 (HAVE_PCLOSE, HAVE_POPEN, HAVE_POSIX_SIGNALBLOCKING)
 (HAVE_PTHREAD_SIGMASK, HAVE_RAISE, HAVE_SIGACTION)
 (HAVE_SIGHANDLER_T, HAVE_SIGINFO_T, HAVE_SIGSET_T)
 (HAVE_STRUCT_SIGACTION_SA_SIGACTION)
 (HAVE_TYPE_VOLATILE_SIG_ATOMIC_T, LIB_PTHREAD)
 (LIB_PTHREAD_SIGMASK, NEXT_AS_FIRST_DIRECTIVE_SIGNAL_H)
 (NEXT_SIGNAL_H, REPLACE_FDOPEN, REPLACE_PTHREAD_SIGMASK)
 (REPLACE_RAISE): New edits.
 (gl_LIBOBJS): Remove md5.o, filemode.o, and sha1.o.  Add
 pthread_sigmask.o.
 (@GL_GENERATE_ALLOCA_H_TRUE@, @GL_GENERATE_ALLOCA_H_FALSE@): Edit
 to comment out unneeded lines.
 (warn-on-use.h): Edit the recipe commands to work with DJGPP
 without requiring a Unixy shell.
 msdos/inttypes.h (strtoimax) [DJGPP < 2.04]: New macro.
 msdos/sed2v2.inp (HAVE_ALLOCA, HAVE_DECL_STRTOLL, HAVE_DECL_STRTOIMAX)
 (HAVE_STRTOLL, HAVE_SIGSET_T, HAVE_SNPRINTF): New edits.

 .bzrignore: Add ./GNUMakefile.unix.
 config.bat: Rename GNUMakefile, so it is not run on MS-DOS.
 Rename signal.in.h and alloca.in.h.

 src/sysdep.c (snprintf) [EOVERFLOW]: If EOVERFLOW is not defined,
 use EDOM.