maint: re-anchor all .gitignore entries.

* bootstrap: Copy from gnulib's latest for the fix to
automatically anchor entries it constructs.
* gnulib: Update to latest just so it has the same bootstrap.
* .gitignore, build-aux/.gitignore, doc/.gitignore:
* lib/.gitignore, m4/.gitignore, po/.gitignore:
* runtime-po/.gitignore: Re-anchor all entries.

m4/.gitignore

@@ -1,141 +1,141 @@
-00gnulib.m4
-alloca.m4
-argmatch.m4
-asm-underscore.m4
-assert.m4
-cloexec.m4
-codeset.m4
-config-h.m4
-dirname.m4
-dos.m4
-double-slash-root.m4
-dup2.m4
-environ.m4
-errno_h.m4
-error.m4
-exponentd.m4
-exponentf.m4
-exponentl.m4
-extensions.m4
-fatal-signal.m4
-fcntl-o.m4
-fcntl.m4
-fcntl_h.m4
-float_h.m4
-fopen.m4
-fpieee.m4
-fprintf-posix.m4
-frexp.m4
-frexpl.m4
-getdtablesize.m4
-getopt.m4
-gettext.m4
-glibc21.m4
-gnulib-cache.m4
-gnulib-common.m4
-gnulib-comp.m4
-gnulib-tool.m4
-hash.m4
-iconv.m4
-include_next.m4
-inline.m4
-intlmacosx.m4
-intmax_t.m4
-inttypes-pri.m4
-inttypes.m4
-inttypes_h.m4
-isnand.m4
-isnanf.m4
-isnanl.m4
-javacomp.m4
-javaexec.m4
-ldexpl.m4
-lib-ld.m4
-lib-link.m4
-lib-prefix.m4
-libunistring-base.m4
-localcharset.m4
-locale-fr.m4
-locale-ja.m4
-locale-zh.m4
-longlong.m4
-malloc.m4
-math_h.m4
-mbrtowc.m4
-mbsinit.m4
-mbstate_t.m4
-mbswidth.m4
-memchr.m4
-mmap-anon.m4
-mode_t.m4
-multiarch.m4
-nls.m4
-nocrash.m4
-open.m4
-pipe.m4
-pipe2.m4
-po.m4
-posix_spawn.m4
-printf-frexp.m4
-printf-frexpl.m4
-printf-posix-rpl.m4
-printf-posix.m4
-printf.m4
-progtest.m4
-quote.m4
-quotearg.m4
-rawmemchr.m4
-realloc.m4
-sched_h.m4
-setenv.m4
-sig_atomic_t.m4
-sigaction.m4
-signal_h.m4
-signalblocking.m4
-signbit.m4
-size_max.m4
-snprintf-posix.m4
-snprintf.m4
-spawn_h.m4
-sprintf-posix.m4
-stat.m4
-stdbool.m4
-stddef_h.m4
-stdint.m4
-stdint_h.m4
-stdio-safer.m4
-stdio_h.m4
-stdlib_h.m4
-stpcpy.m4
-strchrnul.m4
-strerror.m4
-string_h.m4
-strndup.m4
-strnlen.m4
-strtol.m4
-strtoul.m4
-strverscmp.m4
-sys_stat_h.m4
-sys_wait_h.m4
-threadlib.m4
-time_h.m4
-unistd-safer.m4
-unistd_h.m4
-unlocked-io.m4
-vasnprintf.m4
-vfprintf-posix.m4
-vsnprintf-posix.m4
-vsnprintf.m4
-vsprintf-posix.m4
-wait-process.m4
-waitpid.m4
-warn-on-use.m4
-warnings.m4
-wchar_h.m4
-wchar_t.m4
-wctype_h.m4
-wcwidth.m4
-wint_t.m4
-xalloc.m4
-xsize.m4
-xstrndup.m4
+/00gnulib.m4
+/alloca.m4
+/argmatch.m4
+/asm-underscore.m4
+/assert.m4
+/cloexec.m4
+/codeset.m4
+/config-h.m4
+/dirname.m4
+/dos.m4
+/double-slash-root.m4
+/dup2.m4
+/environ.m4
+/errno_h.m4
+/error.m4
+/exponentd.m4
+/exponentf.m4
+/exponentl.m4
+/extensions.m4
+/fatal-signal.m4
+/fcntl-o.m4
+/fcntl.m4
+/fcntl_h.m4
+/float_h.m4
+/fopen.m4
+/fpieee.m4
+/fprintf-posix.m4
+/frexp.m4
+/frexpl.m4
+/getdtablesize.m4
+/getopt.m4
+/gettext.m4
+/glibc21.m4
+/gnulib-cache.m4
+/gnulib-common.m4
+/gnulib-comp.m4
+/gnulib-tool.m4
+/hash.m4
+/iconv.m4
+/include_next.m4
+/inline.m4
+/intlmacosx.m4
+/intmax_t.m4
+/inttypes-pri.m4
+/inttypes.m4
+/inttypes_h.m4
+/isnand.m4
+/isnanf.m4
+/isnanl.m4
+/javacomp.m4
+/javaexec.m4
+/ldexpl.m4
+/lib-ld.m4
+/lib-link.m4
+/lib-prefix.m4
+/libunistring-base.m4
+/localcharset.m4
+/locale-fr.m4
+/locale-ja.m4
+/locale-zh.m4
+/longlong.m4
+/malloc.m4
+/math_h.m4
+/mbrtowc.m4
+/mbsinit.m4
+/mbstate_t.m4
+/mbswidth.m4
+/memchr.m4
+/mmap-anon.m4
+/mode_t.m4
+/multiarch.m4
+/nls.m4
+/nocrash.m4
+/open.m4
+/pipe.m4
+/pipe2.m4
+/po.m4
+/posix_spawn.m4
+/printf-frexp.m4
+/printf-frexpl.m4
+/printf-posix-rpl.m4
+/printf-posix.m4
+/printf.m4
+/progtest.m4
+/quote.m4
+/quotearg.m4
+/rawmemchr.m4
+/realloc.m4
+/sched_h.m4
+/setenv.m4
+/sig_atomic_t.m4
+/sigaction.m4
+/signal_h.m4
+/signalblocking.m4
+/signbit.m4
+/size_max.m4
+/snprintf-posix.m4
+/snprintf.m4
+/spawn_h.m4
+/sprintf-posix.m4
+/stat.m4
+/stdbool.m4
+/stddef_h.m4
+/stdint.m4
+/stdint_h.m4
+/stdio-safer.m4
+/stdio_h.m4
+/stdlib_h.m4
+/stpcpy.m4
+/strchrnul.m4
+/strerror.m4
+/string_h.m4
+/strndup.m4
+/strnlen.m4
+/strtol.m4
+/strtoul.m4
+/strverscmp.m4
+/sys_stat_h.m4
+/sys_wait_h.m4
+/threadlib.m4
+/time_h.m4
+/unistd-safer.m4
+/unistd_h.m4
+/unlocked-io.m4
+/vasnprintf.m4
+/vfprintf-posix.m4
+/vsnprintf-posix.m4
+/vsnprintf.m4
+/vsprintf-posix.m4
+/wait-process.m4
+/waitpid.m4
+/warn-on-use.m4
+/warnings.m4
+/wchar_h.m4
+/wchar_t.m4
+/wctype_h.m4
+/wcwidth.m4
+/wint_t.m4
+/xalloc.m4
+/xsize.m4
+/xstrndup.m4