Fix GDK linking for Gtk typelib and example builds

Add missing GDK linking to GIR build and examples:

  GISCAN Gtk-3.0.gir
  CCLD   gtk-query-immodules-3.0
./.libs/libgtk-3.so: undefined reference to `gdk_keymap_get_modifier_mask'
./.libs/libgtk-3.so: undefined reference to `gdk_modifier_intent_get_type'
./.libs/libgtk-3.so: undefined reference to `gdk_window_begin_resize_drag_for_device'
./.libs/libgtk-3.so: undefined reference to `gdk_event_triggers_context_menu'
collect2: ld returned 1 exit status

  CCLD   grid-packing
../gtk/.libs/libgtk-3.so: undefined reference to `gdk_keymap_get_modifier_mask'
[...]

https://bugzilla.gnome.org/show_bug.cgi?id=664027

examples/Makefile.am

@@ -46,11 +46,9 @@ AM_CPPFLAGS = \
 
 LDADD = \
 	$(top_builddir)/gtk/libgtk-3.la	\
+	$(top_builddir)/gdk/libgdk-3.la \
 	$(GTK_DEP_LIBS)
 
-drawing_LDADD = $(LDADD) \
-	$(top_builddir)/gdk/libgdk-3.la
-
 noinst_PROGRAMS = \
 	hello-world				\
 	window-default				\

gtk/Makefile.am

@@ -1052,7 +1052,7 @@ Gtk_3_0_gir_SCANNERFLAGS += --c-include="gtk/gtkx.h"
 Gtk_3_0_gir_CFLAGS = \
 		$(AM_CPPFLAGS) \
 		-DGTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
-Gtk_3_0_gir_LIBS = libgtk-3.la
+Gtk_3_0_gir_LIBS = libgtk-3.la $(top_builddir)/gdk/libgdk-3.la
 Gtk_3_0_gir_FILES = $(introspection_files)
 Gtk_3_0_gir_EXPORT_PACKAGES = gtk+-3.0
 INTROSPECTION_GIRS += Gtk-3.0.gir