libgimp*: make more libgimp* libraries introspected.

Only libgimpwidgets is not introspected yet as it didn't work from
scratch and I don't have the time right now to look into it. Anyway with
all the others, we already have so many warnings during the GObject
Introspection step now that we have a lot of work to do already!

libgimpmodule/Makefile.am

@@ -56,17 +56,14 @@ EXTRA_DIST = \
 
 lib_LTLIBRARIES = libgimpmodule-@GIMP_API_VERSION@.la
 
+AUTOMAKE_OPTIONS = subdir-objects
+include $(top_srcdir)/libgimpmodule/Makefile.gi
+
 libgimpmodule_@GIMP_API_VERSION@_la_SOURCES = \
-	gimpmoduletypes.h	\
-	gimpmodule.c		\
-	gimpmodule.h		\
-	gimpmoduledb.c		\
-	gimpmoduledb.h
+	$(libgimpmodule_introspectable)
 
 libgimpmoduleinclude_HEADERS = \
-	gimpmoduletypes.h	\
-	gimpmodule.h		\
-	gimpmoduledb.h
+	$(libgimpmodule_introspectable_headers)
 
 libgimpmodule_@GIMP_API_VERSION@_la_LDFLAGS = \
 	-version-info $(LT_VERSION_INFO)	\

libgimpmodule/Makefile.gi

@@ -0,0 +1,11 @@
+# Introspectable sources for libgimpmodule
+
+libgimpmodule_introspectable_headers =	\
+	$(top_srcdir)/libgimpmodule/gimpmoduletypes.h	\
+	$(top_srcdir)/libgimpmodule/gimpmodule.h	\
+	$(top_srcdir)/libgimpmodule/gimpmoduledb.h
+
+libgimpmodule_introspectable =	\
+	$(top_srcdir)/libgimpmodule/gimpmodule.c	\
+	$(top_srcdir)/libgimpmodule/gimpmoduledb.c	\
+	$(libgimpmodule_introspectable_headers)