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.

lib/.cvsignore

@@ -40,6 +40,8 @@ closeout.h
 config.charset
 configmake.h
 creat-safer.c
+dirfd.c
+dirfd.h
 dirname.c
 dirname.h
 dup-safer.c
@@ -47,7 +49,6 @@ error.c
 error.h
 exclude.c
 exclude.h
-exit.h
 exitfail.c
 exitfail.h
 fchmodat.c
@@ -59,6 +60,7 @@ fcntl.h
 fcntl_.h
 fd-safer.c
 fileblocks.c
+float+.h
 fnmatch.c
 fnmatch.h
 fnmatch_.h
@@ -68,7 +70,6 @@ ftruncate.c
 full-write.c
 full-write.h
 getcwd.c
-getcwd.h
 getdate.c
 getdate.h
 getdate.y
@@ -105,17 +106,15 @@ lstat.h
 malloc.c
 mbchar.c
 mbchar.h
+mbscasecmp.c
 mbuiter.h
 memchr.c
 mempcpy.c
-mempcpy.h
 memrchr.c
-memrchr.h
 memset.c
 minmax.h
 mkdirat.c
 mkdtemp.c
-mkdtemp.h
 mktime.c
 modechange.c
 modechange.h
@@ -173,23 +172,21 @@ stdbool.h
 stdbool_.h
 stdint.h
 stdint_.h
+stdio.h
+stdio_.h
+stdlib.h
+stdlib_.h
 stpcpy.c
-stpcpy.h
-strcase.h
 strcasecmp.c
 strchrnul.c
-strchrnul.h
 strdup.c
-strdup.h
 strerror.c
 string.h
 string_.h
 stripslash.c
 strncasecmp.c
 strndup.c
-strndup.h
 strnlen.c
-strnlen.h
 strnlen1.c
 strnlen1.h
 strtoimax.c
@@ -206,13 +203,15 @@ system-ioctl.h
 system.h
 tempname.c
 tempname.h
+time.h
+time_.h
 time_r.c
-time_r.h
 timespec.h
 uinttostr.c
 umaxtostr.c
 unistd--.h
 unistd-safer.h
+unistd.h
 unistd_.h
 unlinkdir.c
 unlinkdir.h
@@ -227,7 +226,6 @@ version-etc-fsf.c
 version-etc.c
 version-etc.h
 vsnprintf.c
-vsnprintf.h
 wchar_.h
 wctype_.h
 wcwidth.h