examples: Add hello-c-http example.

examples: Add hello-c-http example.

* gettext-tools/examples/hello-c-http/INSTALL: New file.
* gettext-tools/examples/hello-c-http/autogen.sh: New file, based on
gettext-tools/examples/hello-c/autogen.sh.
* gettext-tools/examples/hello-c-http/autoclean.sh: New file, based on
gettext-tools/examples/hello-c/autoclean.sh.
* gettext-tools/examples/hello-c-http/hello-server.c: New file.
* gettext-tools/examples/hello-c-http/Makefile.am: New file, based on
gettext-tools/examples/hello-c/Makefile.am.
* gettext-tools/examples/hello-c-http/configure.ac: New file, based on
gettext-tools/examples/hello-c/configure.ac.
* gettext-tools/examples/hello-c-http/m4/Makefile.am: New file, copied from
gettext-tools/examples/hello-c/m4/Makefile.am.
* gettext-tools/examples/hello-c-http/po/POTFILES.in: New file.
* gettext-tools/examples/hello-c-http/po/Makevars: New file, copied from
gettext-tools/examples/hello-c/po/Makevars.
* gettext-tools/examples/hello-c-http/po/LINGUAS: New file, copied from
gettext-tools/examples/hello-c/po/LINGUAS.
* gettext-tools/examples/Makefile.am (EXAMPLESFILES, EXAMPLESDIRS): Add
hello-c-http.
* gettext-tools/examples/po/Makefile.am (POTFILES, SMALLPOTS): Update for
hello-c-http.
(hello-c-http.pot): New target.
(SMALLPOFILES_FOR_lang): Update for hello-c-http.
($(srcdir)/../hello-c-http/po/$(LL).po): New rule.
* gettext-tools/examples/check-examples (func_check_autoclean_all,
func_check_distclean_all, func_check_maintainerclean_all,
func_check_maintainerclean_vpath_all, func_check_dist_all,
func_check_dist_vpath_all, func_check_install_all, func_check_uninstall_all,
func_check_distcheck_all, func_check_all): Handle hello-c-http as well.
* gettext-tools/examples/README: Mention hello-c-http.
* NEWS: Likewise.