Ensure that the cache directory exists before calling compiler.

Bug: 7077014
Change-Id: Iab94a265193d4ff749573520939c974a982ac7c1
diff --git a/rsScriptC.h b/rsScriptC.h
index 6bc41f2..4ef2c4b 100644
--- a/rsScriptC.h
+++ b/rsScriptC.h
@@ -65,6 +65,7 @@
 #ifndef ANDROID_RS_SERIALIZE
     bcinfo::BitcodeTranslator *BT;
 #endif
+    bool createCacheDir(const char *cacheDir);
 };
 
 class ScriptCState {