gtk-ui: Use gtkbuilder xml file as canonical source for UI

Stop running gtkbuilder-convert on build. This was done to workaround
a glade bug but is not necessary anymore

configure.ac

@@ -588,7 +588,6 @@ if test $enable_gui != "no"; then
 
     PKG_CHECK_MODULES(GUI, $gui_modules)
 
-    AC_PATH_PROG([GTK_BUILDER_CONV], gtk-builder-convert)
 elif test "$enable_dbus_service" = "yes"; then
     # syncevo-dbus-server needs localization
     :

src/gtk-ui/gtk-ui.am

@@ -39,12 +39,8 @@ dist_src_gtk_ui_themerc_DATA = $(src_gtk_ui_themercfiles)
 src_gtk_ui_desktopdir = $(datadir)/applications
 
 dist_noinst_DATA += \
-  src/gtk-ui/ui.glade \
   $(src_gtk_ui_applications_in_files)
 
-src/gtk-ui/ui.xml: src/gtk-ui/ui.glade
-	$(AM_V_GEN)$(GTK_BUILDER_CONV) $< $@
-
 # sync-ui: default GUI, could be plain GTK or Moblin UX
 # sync-ui-gtk: GTK GUI
 # sync-ui-moblin: Moblin UX
@@ -99,6 +95,5 @@ src_gtk_ui_sync_ui_moblin_CFLAGS = $(src_gtk_ui_sync_ui_CFLAGS)
 src_gtk_ui_sync_ui_moblin_CPPFLAGS = $(src_gtk_ui_sync_ui_CPPFLAGS) -DUSE_MOBLIN_UX
 
 CLEANFILES += \
-  src/gtk-ui/ui.xml \
   src/gtk-ui/sync-moblin.desktop \
   $(src_gtk_ui_applications_generated)