Fix builtin parsing

hlsl_builtin.jai

@@ -1,6 +1,5 @@
-HLSL_BUILTIN : string;
-
-#run {
-	HLSL_BUILTIN = read_entire_file("hlsl_builtin.shd");
-}
+HLSL_BUILTIN :: #run -> string {
+	// return read_entire_file("./hlsl_builtin.shd");
+	return "";
+};