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0608425d - build: Use a separate gnulib-tool invocation for gettext-tools/tests/.

build: Use a separate gnulib-tool invocation for gettext-tools/tests/. * autogen.sh (GNULIB_MODULES_LIBGETTEXTLIB, GNULIB_MODULES_TOOLS_TESTS): New variables. Add a gnulib-tool invocation for gettext-tools/tests/gnulib-{m4,lib}. Add option -I tests/gnulib-m4 when generating gettext-tools/configure. * gettext-tools/tests/gnulib-lib/Makefile.am: New file. * gettext-tools/tests/Makefile.am (SUBDIRS): New variable. (AM_CPPFLAGS): Add more -I options. (EXTRA_DIST): Add gnulib-m4/gnulib-cache.m4. * gettext-tools/Makefile.am (ACLOCAL_AMFLAGS): Add -I tests/gnulib-m4. * gettext-tools/configure.ac: Invoke gttgl_EARLY and gttgl_INIT. Add an AC_CONFIG_FILES of tests/gnulib-lib/Makefile.