Fix mac soong build

Change-Id: I50b3ca1af571d00a0cc5efc80c5d1c6f0b1f789b
diff --git a/cc/builder.go b/cc/builder.go
index 02ea63d..f1282f5 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -96,8 +96,8 @@
 
 	darwinStrip = pctx.StaticRule("darwinStrip",
 		blueprint.RuleParams{
-			Command:     "${macStripPath} -u -r -o $out $in",
-			CommandDeps: []string{"${macStripPath}"},
+			Command:     "${config.MacStripPath} -u -r -o $out $in",
+			CommandDeps: []string{"${config.MacStripPath}"},
 			Description: "strip $out",
 		})