Redirect debug output to logcat.

If ADB_TRACE is enabled, debug output will be redirected to logcat.

Change-Id: I9c36ada7690a2b946ecd6a926d04e36a8313c36a
diff --git a/Android.mk b/Android.mk
index 80427b8..44c3215 100644
--- a/Android.mk
+++ b/Android.mk
@@ -167,7 +167,7 @@
 
 LOCAL_MODULE := adb
 
-LOCAL_STATIC_LIBRARIES := libzipfile libunz libcutils
+LOCAL_STATIC_LIBRARIES := libzipfile libunz libcutils liblog
 
 LOCAL_SHARED_LIBRARIES := libcrypto