Fix several minor errors in the build configuration.

Change-Id: I3445c97e96b8e59bd6b954dbf9ffdd2ceffd05eb
diff --git a/Android.common.mk b/Android.common.mk
index daa4ab4..94a5ac8 100644
--- a/Android.common.mk
+++ b/Android.common.mk
@@ -14,6 +14,10 @@
 # limitations under the License.
 #
 
+LOCAL_CPP_EXTENSION := .cc
+
+AEXEC_LOCAL_SRC_FILES := \
+	src/main.cc
+
 LIBART_LOCAL_SRC_FILES := \
 	src/art.cc
-