Use -Werror in Android builds.

Suppress existing warnings.

Bug b/66996870

Change-Id: I9b78f840638a57c2559ccc4dbc583cc6a6e21c14
Reviewed-on: https://swiftshader-review.googlesource.com/17630
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
diff --git a/src/Android.mk b/src/Android.mk
index 3eebf5a..945daf8 100644
--- a/src/Android.mk
+++ b/src/Android.mk
@@ -102,7 +102,14 @@
 
 COMMON_CFLAGS := \
 	-DLOG_TAG=\"swiftshader\" \
+	-Wall \
+	-Werror \
+	-Wno-format \
+	-Wno-switch \
+	-Wno-unused-local-typedef \
 	-Wno-unused-parameter \
+	-Wno-unused-value \
+	-Wno-unused-variable \
 	-Wno-implicit-exception-spec-mismatch \
 	-Wno-overloaded-virtual \
 	-Wno-non-virtual-dtor \