build: Add a separate configure.ac in gettext-runtime/intl/.

build: Add a separate configure.ac in gettext-runtime/intl/.

* autogen.sh (GNULIB_MODULES_RUNTIME_OTHER): Remove bison. Instead, copy
bison.m4 explicitly.
Generate configure file also in gettext-runtime/intl/.
Do automake invocations top-down, not bottom-up.
* gettext-runtime/intl/Makefile.am (ACLOCAL_AMFLAGS, SUBDIRS): New variables.
* gettext-runtime/m4/gettext.m4 (AM_GNU_GETTEXT): Allow 'here' as INTLSYMBOL
argument.
* gettext-runtime/intl/configure.ac: New file, based on
gettext-runtime/configure.ac.
* gettext-runtime/intl/AUTHORS: New file.
* gettext-runtime/intl/NEWS: New file.
* gettext-runtime/intl/README: New file.
* gettext-runtime/intl/ABOUT-NLS: New file, copied from
gettext-runtime/ABOUT-NLS.
* gettext-runtime/intl/INSTALL: New file, copied from gettext-runtime/INSTALL.
* gettext-runtime/configure.ac: Define WINDRES. Pass third argument to
AM_GNU_GETTEXT. Remove conditionals USE_INCLUDED_LIBINTL,
BUILD_INCLUDED_LIBINTL, PRELOADABLE_LIBINTL. Invoke AC_CONFIG_SUBDIRS([intl]).
Don't create intl/Makefile from here.
* gettext-tools/configure.ac: Define WINDRES. Redefine __libc_lock_*, for use
in localealias.c. Invoke gt_GLIBC2.