Code cleanup to avoid LLVM dependency when building with quick only.

Change-Id: I0985c227d775c72fd23975d4c9bf673ba32615c2
diff --git a/build/Android.common.mk b/build/Android.common.mk
index 1299beb..704da68 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -127,6 +127,8 @@
 	-Wall \
 	-Werror \
 	-Wextra \
+	-Wno-sign-promo \
+	-Wno-unused-parameter \
 	-Wstrict-aliasing \
 	-fstrict-aliasing