Update gnulib to latest.

m4/.gitignore

@@ -2,13 +2,16 @@
 /absolute-header.m4
 /alloca.m4
 /arpa_inet_h.m4
+/asm-underscore.m4
 /byteswap.m4
 /close.m4
 /closeout.m4
 /close-stream.m4
 /codeset.m4
 /ctype.m4
+/dirname.m4
 /dos.m4
+/double-slash-root.m4
 /dup2.m4
 /eealloc.m4
 /environ.m4
@@ -26,10 +29,12 @@
 /fpending.m4
 /fpieee.m4
 /fstat.m4
+/ftruncate.m4
 /getcwd.m4
 /getdtablesize.m4
 /getopt.m4
 /getpagesize.m4
+/getprogname.m4
 /gettext.m4
 /gettimeofday.m4
 /glibc21.m4
@@ -38,8 +43,10 @@
 /gnulib-comp.m4
 /gnulib-tool.m4
 /gnu-make.m4
+/host-cpu-c-abi.m4
 /iconv.m4
 /include_next.m4
+/inet_pton.m4
 /inline.m4
 /intdiv0.m4
 /intldir.m4
@@ -49,20 +56,25 @@
 /inttypes_h.m4
 /inttypes.m4
 /inttypes-pri.m4
+/ioctl.m4
+/isblank.m4
 /largefile.m4
 /lcmessage.m4
 /lib-ld.m4
 /lib-link.m4
 /lib-prefix.m4
+/limits-h.m4
 /localcharset.m4
 /locale-fr.m4
 /locale-ja.m4
 /locale-zh.m4
+/localtime-buffer.m4
 /lock.m4
 /longlong.m4
 /lstat.m4
 /malloca.m4
 /malloc.m4
+/manywarnings-c++.m4
 /manywarnings.m4
 /math_h.m4
 /mbrtowc.m4
@@ -74,30 +86,44 @@
 /msvc-inval.m4
 /msvc-nothrow.m4
 /multiarch.m4
+/nanosleep.m4
 /netinet_in_h.m4
 /nls.m4
 /nocrash.m4
 /off_t.m4
 /onceonly.m4
+/open-cloexec.m4
 /open.m4
 /pathmax.m4
+/perror.m4
+/pipe.m4
 /po.m4
 /printf.m4
 /printf-posix.m4
 /progtest.m4
+/pthread_rwlock_rdlock.m4
+/pthread_sigmask.m4
 /putenv.m4
 /quotearg.m4
 /raise.m4
 /rawmemchr.m4
 /read.m4
 /safe-read.m4
 /safe-write.m4
+/select.m4
 /setenv.m4
+/sigaction.m4
+/signalblocking.m4
 /signal_h.m4
 /size_max.m4
+/sleep.m4
+/socketlib.m4
+/sockets.m4
+/socklen.m4
 /sockpfaf.m4
 /ssize_t.m4
 /stat.m4
+/stat-time.m4
 /stdalign.m4
 /stdbool.m4
 /stddef_h.m4
@@ -107,6 +133,7 @@
 /stdlib_h.m4
 /strchrnul.m4
 /strerror.m4
+/strerror_r.m4
 /string_h.m4
 /strndup.m4
 /strnlen.m4
@@ -115,14 +142,19 @@
 /strtoull.m4
 /strtoul.m4
 /symlink.m4
+/sys_ioctl_h.m4
+/sys_select_h.m4
 /sys_socket_h.m4
 /sys_stat_h.m4
 /sys_time_h.m4
 /sys_types_h.m4
+/sys_uio_h.m4
 /threadlib.m4
+/thread.m4
 /time_h.m4
 /uintmax_t.m4
 /unistd_h.m4
+/usleep.m4
 /vasnprintf.m4
 /vasprintf.m4
 /visibility.m4
@@ -138,5 +170,4 @@
 /xalloc.m4
 /xsize.m4
 /xstrtol.m4
-/thread.m4
 /yield.m4