Add Babl-$(BABL_API_VERSION).gir dependencies for proper
auto-recompilation.
INTROSPECTION_COMPILER_ARGS = --includedir=$(srcdir)
if HAVE_INTROSPECTION
-Babl-$(BABL_API_VERSION).gir: $(G_IR_SCANNER)
+Babl-$(BABL_API_VERSION).gir: $(G_IR_SCANNER) $(library_include_HEADERS) $(c_sources) $(srcdir)/Makefile.am
$(INTROSPECTION_SCANNER) -v --namespace Babl --nsversion=$(BABL_API_VERSION) \
--add-include-path=$(srcdir) --add-include-path=. \
--library=babl-$(BABL_API_VERSION) \