Adjust to latest Gnulib.

* lib/.cvsignore: Add dirfd.c, dirfd.h, float+.h, mbscasecmp.c,
stdio.h, stdio_.h, stdlib.h, stdlib_.h, time.h, time_.h, unistd.h.
Remove exit.h, getcwd.h, mempcpy.h, memrchr.h, mkdtemp.h, stpcpy.h,
strcase.h, strchrnul.h, strdup.h, strndup.h, strnlen.h, time_r.h,
vsnprintf.h.
* m4/.cvsignore: Remove localedir.h.  Sort.

src/.cvsignore

@@ -1,7 +1,6 @@
-Makefile.in
-Makefile
-localedir.h
-rmt
-tar
 .deps
 .gdbinit
+Makefile
+Makefile.in
+rmt
+tar