Add more functionality to the thread and mutex implementation.

Change-Id: I33b2e53acb4c4c6653f13f1bbdd77cc7ce27e581
diff --git a/build/Android.common.mk b/build/Android.common.mk
index 4798d63..30a63ca 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -49,7 +49,8 @@
 	src/object.cc \
 	src/raw_dex_file.cc \
 	src/runtime.cc \
-	src/stringpiece.cc
+	src/stringpiece.cc \
+	src/thread.cc
 
 ifeq ($(LIBART_TARGET_ARCH),arm)
 LIBART_LOCAL_SRC_FILES += \