GLES2Dbg: use libLZF for compressing images

liblzf is in external/liblzf, it's BSD-type licence (optionally GPL2)

Change-Id: Idc7883fe2155f366cda384e64796a1493335ae4f
Signed-off-by: David Li <davidxli@google.com>
diff --git a/opengl/libs/Android.mk b/opengl/libs/Android.mk
index 123306b6..7d72729 100644
--- a/opengl/libs/Android.mk
+++ b/opengl/libs/Android.mk
@@ -13,7 +13,7 @@
 	EGL/hooks.cpp 	       \
 	EGL/Loader.cpp 	       \
 #
-LOCAL_STATIC_LIBRARIES += libGLESv2_dbg libprotobuf-cpp-2.3.0-lite
+LOCAL_STATIC_LIBRARIES += libGLESv2_dbg libprotobuf-cpp-2.3.0-lite liblzf
 LOCAL_SHARED_LIBRARIES += libcutils libutils libstlport
 LOCAL_LDLIBS := -lpthread -ldl
 LOCAL_MODULE:= libEGL