intl: Update from gnulib
* config.charset, localcharset.c, relocatable.c, vasnprintf.c:
Update from gnulib.
* codeset.m4, extern-inline.m4, fcntl-o.m4, gettext.m4, glibc2.m4:
* glibc21.m4, iconv.m4, intdiv0.m4, intldir.m4, intlmacosx.m4:
* intmax.m4, inttypes-pri.m4, inttypes_h.m4, lcmessage.m4, lock.m4:
* longlong.m4, nls.m4, printf-posix.m4, progtest.m4:
* size_max.m4, stdint_h.m4, threadlib.m4, uintmax_t.m4:
* visibility.m4, wchar_t.m4, wint_t.m4, xsize.m4: Update copyright
year.
