glcpp: Set locations on tokens.
diff --git a/glcpp/glcpp.h b/glcpp/glcpp.h
index 1d139af..2d4c847 100644
--- a/glcpp/glcpp.h
+++ b/glcpp/glcpp.h
@@ -72,6 +72,7 @@
 struct token {
 	int type;
 	YYSTYPE value;
+	YYLTYPE location;
 };
 
 typedef struct token_node {