Replace the vala files that use DBus with their generated c files.

With vala >= 0.14 these files generate GDbus code instead of the deprecated
dbus-glib code. AWN and libdesktop-agnostic  needs to be ported to GDbus but
it's faster to just replace the two files for now.
.
Included changes:
 - awnterm needed Vala 0.12 due to GDbus.
 - related needed Vala 0.12 due to GDbus.
 - notification-area uses GLib.Timeout.

Makefile.am

@@ -28,8 +28,6 @@ DISTCLEANFILES = \
         intltool-update \
         $(NULL)
 
-VALAC = valac-0.12
-
 ACLOCAL_AMFLAGS = -I m4
 
 DISTCHECK_CONFIGURE_FLAGS = --disable-pymod-checks

applets/maintained/awnterm/Makefile.am

@@ -1,8 +1,6 @@
 APPLET_NAME = awnterm
 APPLET_CFLAGS = $(VTE_CFLAGS)
-VALAC = valac-0.12
 VALA_FILES = \
-	awn-terminal.vala \
 	$(NULL)
 AM_VALAFLAGS = \
 	--pkg=libintl \
@@ -11,12 +9,13 @@ AM_VALAFLAGS = \
 	$(srcdir)/keybinder.vapi \
 	$(NULL)
 
-include $(top_srcdir)/Makefile.vala-applet
+include $(top_srcdir)/Makefile.c-applet
 include $(top_srcdir)/Makefile.schemas
 
 applet_LTLIBRARIES = awnterm.la
 awnterm_la_SOURCES =	\
 	$(VALA_C_FILES) \
+	awn-terminal.c \
 	eggaccelerators.c \
 	eggaccelerators.h \
 	keybinder.c \