Gdk: add an experimental backend for mir

This is disabled by default.  Enable with --enable-mir-backend.

This backend is a combined work of Robert Ancell and Ryan Lortie.

gdk/mir/Makefile.am

@@ -0,0 +1,39 @@
+## Process this file with automake to produce Makefile.in
+include $(top_srcdir)/Makefile.decl
+
+libgdkincludedir = $(includedir)/gtk-3.0/gdk
+libgdkmirincludedir = $(includedir)/gtk-3.0/gdk/mir
+
+AM_CPPFLAGS = \
+	-DG_LOG_DOMAIN=\"Gdk\" \
+	-DGDK_COMPILATION \
+	-I$(top_srcdir) \
+	-I$(top_srcdir)/gdk \
+	-I$(top_builddir)/gdk \
+	$(GDK_HIDDEN_VISIBILITY_CFLAGS) \
+	$(GTK_DEBUG_FLAGS) \
+	$(GDK_DEP_CFLAGS)
+
+LDADDS = $(GDK_DEP_LIBS)
+
+noinst_LTLIBRARIES = \
+	libgdk-mir.la
+
+libgdk_mir_la_SOURCES =	\
+	gdkmircursor.c \
+	gdkmirdevicemanager.c \
+	gdkmirdisplay.c \
+	gdkmireventsource.c	\
+	gdkmirkeyboard.c \
+	gdkmirkeymap.c \
+	gdkmirpointer.c \
+	gdkmirscreen.c	\
+	gdkmirwindow.c	\
+	gdkmirwindowimpl.c	\
+	gdkmir-debug.c	\
+	gdkmir.h
+
+libgdkinclude_HEADERS = \
+	gdkmir.h
+
+-include $(top_srcdir)/git.mk