app, devel-docs: remove dangling DBUS_GLIB_* variables.

dbus-glib is no more a dependency since commit c4460e84, i.e. already
since 2013!

(cherry picked from commit 5f2a6940e3)

app/Makefile.am

@@ -220,7 +220,6 @@ gimp_@GIMP_APP_VERSION@_LDADD = \
 	$(libgimpwidgets)		\
 	$(GTK_LIBS)			\
 	$(GTK_MAC_INTEGRATION_LIBS)	\
-	$(DBUS_GLIB_LIBS)		\
 	$(gimpconsoleldadd)		\
 	$(exchndl)			\
 	$(GIMPRC)

app/gui/Makefile.am

@@ -17,7 +17,6 @@ AM_CPPFLAGS = \
 	$(GEGL_CFLAGS)				\
 	$(GTK_CFLAGS)				\
 	$(GTK_MAC_INTEGRATION_CFLAGS)		\
-	$(DBUS_GLIB_CFLAGS)			\
 	-I$(includedir)
 
 AM_CFLAGS = \

app/tests/Makefile.am

@@ -73,7 +73,6 @@ AM_CPPFLAGS = \
 	-I$(top_srcdir)/app	\
 	$(PANGOCAIRO_CFLAGS)	\
 	$(GTK_CFLAGS)		\
-	$(DBUS_GLIB_CFLAGS)	\
 	$(GEGL_CFLAGS)		\
 	$(xobjective_c)		\
 	-I$(includedir)
@@ -132,7 +131,6 @@ LDADD = \
 	$(GIMPICONRC)							\
 	$(GTK_LIBS)							\
 	$(GTK_MAC_INTEGRATION_LIBS)					\
-	$(DBUS_GLIB_LIBS)						\
 	$(GDK_PIXBUF_LIBS)						\
 	$(FREETYPE_LIBS)						\
 	$(FONTCONFIG_LIBS)						\

devel-docs/app/Makefile.am

@@ -104,7 +104,6 @@ GTKDOC_LIBS = \
         $(FONTCONFIG_LIBS)                                                   \
         $(FREETYPE_LIBS)                                                     \
         $(HARFBUZZ_LIBS)                                                     \
-	$(DBUS_GLIB_LIBS)						     \
 	$(GEGL_LIBS)							     \
 	$(RT_LIBS)							     \
 	$(INTLLIBS)							     \