Use the versioned libmutter*.so versions

Mutter now provides versioned libraries and pkg-config files, meaning
an application using libmutter and friends need to depend on a specific
version of the API.

https://bugzilla.gnome.org/show_bug.cgi?id=777317

js/Makefile.am

@@ -11,6 +11,7 @@ misc/config.js: misc/config.js.in Makefile
 	    -e "s|[@]datadir@|$(datadir)|g" \
 	    -e "s|[@]libexecdir@|$(libexecdir)|g" \
 	    -e "s|[@]sysconfdir@|$(sysconfdir)|g" \
+	    -e "s|[@]LIBMUTTER_API_VERSION@|$(LIBMUTTER_API_VERSION)|g" \
                $< > $@
 
 js_resource_files = $(shell $(GLIB_COMPILE_RESOURCES) --sourcedir=$(srcdir) --sourcedir=$(builddir) --generate-dependencies $(srcdir)/js-resources.gresource.xml)

js/misc/config.js.in

@@ -15,3 +15,5 @@ const LOCALEDIR = '@datadir@/locale';
 /* other standard directories */
 const LIBEXECDIR = '@libexecdir@';
 const SYSCONFDIR = '@sysconfdir@';
+/* g-i package versions */
+const LIBMUTTER_API_VERSION = '@LIBMUTTER_API_VERSION@'

js/ui/environment.js

@@ -1,6 +1,8 @@
 // -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
 
-imports.gi.versions.Clutter = '1.0';
+const Config = imports.misc.config;
+
+imports.gi.versions.Clutter = Config.LIBMUTTER_API_VERSION;
 imports.gi.versions.Gio = '2.0';
 imports.gi.versions.Gdk = '3.0';
 imports.gi.versions.GdkPixbuf = '2.0';