Port server core to Android

 * Android libutils locks and threads
 * Add Android.mk for building with AOSP
 * Add logger sink for Android
 * Regenerate Android.mk when CMake is run
diff --git a/Android.mk b/Android.mk
new file mode 100644
index 0000000..ea7451c
--- /dev/null
+++ b/Android.mk
@@ -0,0 +1,3 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(call first-makefiles-under,$(LOCAL_PATH))