Don't add 'gnulib-lib' to include path when compiling libgettextpo tests.
autopoint: recognize multiple arguments of AM_GNU_GETTEXT when tracing
autopoint: discard stderr of autom4te
autopoint: use 'm4' as the fallback macro directory
Fix misuse of a logical operator.
autopoint: disable m4_include and m4_esyscmd when tracing

* autopoint.in (func_trace): Disable m4_include and m4_esyscmd.
* gettextize.in (func_trace): Likewise.
Reported by Bernhard Voelker in
<https://lists.gnu.org/archive/html/bug-gettext/2013-11/msg00011.html>
and suggested by Eric Blake at <https://savannah.gnu.org/bugs/?40083>.
autopoint: Allow user to specify custom autom4te executable

* autopoint.in (func_trace): Allow user to specify autom4te
executable name through $AUTOM4TE envvar.
* gettextize.in (func_trace): Likewise.
Suggested by Eric Blake at
<https://lists.gnu.org/archive/html/bug-gettext/2013-12/msg00006.html>.
libgrep: Fix issues detected by gcc -Wformat-security

* m-fgrep.c (Fcompile): Supply FORMAT argument of error.
* m-regex.c (compile): Likewise.
Add missing extern-inline.m4 into archive

Problem reported by Reuben Thomas in:
<https://lists.gnu.org/archive/html/bug-gettext/2013-12/msg00010.html>.
* gettext-runtime/m4/extern-inline.m4: New file, from gnulib.
* gettext-runtime/m4/intl.m4 (AM_INTL_SUBDIR): Require gl_EXTERN_INLINE.
* gettext-runtime/m4/Makefile.am (EXTRA_DIST): Update.
* gettext-tools/m4/Makefile.am (aclocal_DATA): Add extern-inline.m4.
* Makefile.am (distcheck-hook): Check extern-inline.m4.