Add support for building Filterscript files.

This change piggybacks Filterscript rules onto the existing Renderscript
rules. There is no real difference other than the file extension (which
llvm-rs-cc uses to apply a more stringent set of warnings/errors).

Bug: 7166741
Change-Id: I27175ff1c16c27129cafa92b4e8caabf2e5f4150
diff --git a/core/definitions.mk b/core/definitions.mk
index 13af6fc..aa23d9d 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -269,7 +269,7 @@
 define all-renderscript-files-under
 $(patsubst ./%,%, \
   $(shell cd $(LOCAL_PATH) ; \
-          find $(1) -name "*.rs" -and -not -name ".*") \
+          find $(1) \( -name "*.rs" -or -name "*.fs" \) -and -not -name ".*") \
   )
 endef