hello-c-gnome3: Add a simpler "hello world" program.

hello-c-gnome3: Add a simpler "hello world" program.

* gettext-tools/examples/hello-c-gnome3/README: New file.
* gettext-tools/examples/hello-c-gnome3/hello2.c: New file, based on
gettext-tools/examples/hello-c-gnome3/hello.c.
* gettext-tools/examples/hello-c-gnome3/hello2.desktop.in.in: New file, based on
gettext-tools/examples/hello-c-gnome3/hello.desktop.in.in.
* gettext-tools/examples/hello-c-gnome3/hello2.gresource.xml: New file, based on
gettext-tools/examples/hello-c-gnome3/hello.gresource.xml.
* gettext-tools/examples/hello-c-gnome3/hello2.ui: Renamed from
gettext-tools/examples/hello-c-gnome3/hello.ui.
* gettext-tools/examples/hello-c-gnome3/hello2.gschema.xml: New file, based on
gettext-tools/examples/hello-c-gnome3/hello.gschema.xml.
* gettext-tools/examples/hello-c-gnome3/hello.c: Greatly simplified.
* gettext-tools/examples/hello-c-gnome3/hello.ui: Use an <object> element
instead of a <template> element.
* gettext-tools/examples/hello-c-gnome3/hello.gschema.xml: Remove file.
* gettext-tools/examples/hello-c-gnome3/Makefile.am (bin_PROGRAMS): Add hello2.
(hello-resources.c): Renamed from resources.c.
(hello2_SOURCES): New variable.
(hello2-resources.c): New target.
(desktop_DATA): Add hello2.desktop.
(hello2.desktop.in, hello2.desktop): New targets.
(BUILT_SOURCES, CLEANFILES, MAINTAINERCLEANFILES): Update.
(EXTRA_DIST): Remove hello.gschema.xml. Add hello2.desktop.in.in,
hello2.desktop.in, hello2.gresource.xml, hello2.ui, hello2.gschema.xml.
* gettext-tools/examples/hello-c-gnome3/po/POTFILES.in: Update.
* gettext-tools/examples/hello-c-gnome3/autoclean.sh: Update.
* gettext-tools/examples/Makefile.am (EXAMPLESFILES): Update.
* gettext-tools/examples/po/Makefile.am (POTFILES): Update.