xgettext: In language JavaScript, avoid a crash at an XML comment, CDATA, or PI.
* gettext-tools/src/x-javascript.c (phase5_scan_xml_markup): Return int instead
of bool.
(phase5_get): Ignore XML markup parsed by phase5_scan_xml_markup.
* gettext-tools/tests/xgettext-javascript-9: New file.
* gettext-tools/tests/xgettext-javascript-10: New file.
* gettext-tools/tests/xgettext-javascript-11: New file.
* gettext-tools/tests/Makefile.am (TESTS): Add them.