Allow cc_object modules to use STL

cc_object modules may need access to the STL headers.

Test: m checkbuild
Change-Id: I88ad556a349d9530d24949f05eebf8b6fab4c62a
diff --git a/cc/object.go b/cc/object.go
index b5fd835..7c134ac 100644
--- a/cc/object.go
+++ b/cc/object.go
@@ -39,6 +39,7 @@
 		baseLinker: NewBaseLinker(nil),
 	}
 	module.compiler = NewBaseCompiler()
+	module.stl = &stl{}
 	return module.Init()
 }