m4, help2man: Update from gnulib
* gettext-runtime/m4/codeset.m4: Update copyright year.
* gettext-runtime/m4/gettext.m4: Likewise.
* gettext-runtime/m4/iconv.m4: Likewise.
* gettext-runtime/m4/intl.m4: Likewise.
* gettext-runtime/m4/intldir.m4: Likewise.
* gettext-runtime/m4/intlmacosx.m4: Likewise.
* gettext-runtime/m4/lcmessage.m4: Likewise.
* gettext-runtime/m4/nls.m4: Likewise.
* gettext-runtime/m4/po.m4: Likewise.
* gettext-runtime/m4/extern-inline.m4: Likewise. Port the following
change:
2015-04-29 Paul Eggert <eggert@cs.ucla.edu>
extern-inline: no need for workaround in GCC 5.1
* doc/extern-inline.texi (extern inline):
* m4/extern-inline.m4 (gl_EXTERN_INLINE):
GCC bugs 54113 and 63877 are fixed in GCC 5.1, so don't work
around these bugs in GCC 5.1 and later. Maybe in a decade or
two we can remove these workarounds.
* gettext-tools/man/help2man: Update copyright year.
