Switch adb over to clang.

Change-Id: Ib5511dcba56e80ffce6bc293d99251ccfd61c330
diff --git a/adb/Android.mk b/adb/Android.mk
index 3b8972e..2ea89e9 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -5,7 +5,7 @@
 
 LOCAL_PATH:= $(call my-dir)
 
-ADB_CLANG :=
+ADB_CLANG := true
 
 # libadb
 # =========================================================