Don't include rs_graphics.rsh by default.
Fix the Externalize in slang_driver.cpp.

Change-Id: Idce037b0150af3ea9968e39b7bce63a0e1b6d9a5
diff --git a/slang.cpp b/slang.cpp
index e155483..0181c7b 100644
--- a/slang.cpp
+++ b/slang.cpp
@@ -359,7 +359,7 @@
 }
 
 int Slang::generateDepFile() {
-  if(mDiagnostics->getNumErrors() > 0)
+  if (mDiagnostics->getNumErrors() > 0)
     return mDiagnostics->getNumErrors();
   if (mDOS.get() == NULL)
     return 1;