android: add support for egl_dri2

Add rules to build egl_dri2 and make it a built-in EGL driver of
libGLES_mesa.

Reviewed-by: Chad Versace <chad@chad-versace.us>
diff --git a/Android.mk b/Android.mk
index ed68aec..bc4b74e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -26,7 +26,8 @@
 #   classic drivers:
 #   gallium drivers: swrast i915g nouveau r300g r600g vmwgfx
 #
-# The main target is libGLES_mesa.  There is no classic drivers yet.
+# The main target is libGLES_mesa.  For each classic driver enabled, a DRI
+# module will also be built.  DRI modules will be loaded by libGLES_mesa.
 
 MESA_TOP := $(call my-dir)
 MESA_COMMON_MK := $(MESA_TOP)/Android.common.mk
@@ -76,6 +77,10 @@
 	src/mesa \
 	src/egl/main
 
+ifeq ($(strip $(MESA_BUILD_CLASSIC)),true)
+SUBDIRS += src/egl/drivers/dri2
+endif
+
 ifeq ($(strip $(MESA_BUILD_GALLIUM)),true)
 SUBDIRS += src/gallium
 endif
@@ -107,6 +112,10 @@
 LOCAL_SHARED_LIBRARIES += libdrm
 endif
 
+ifeq ($(strip $(MESA_BUILD_CLASSIC)),true)
+LOCAL_STATIC_LIBRARIES += libmesa_egl_dri2
+endif
+
 ifeq ($(strip $(MESA_BUILD_GALLIUM)),true)
 
 gallium_DRIVERS :=