glcpp: Print to the main compiler's infolog, not stdout.
diff --git a/glsl_parser_extras.h b/glsl_parser_extras.h
index 1edd86b..87de908 100644
--- a/glsl_parser_extras.h
+++ b/glsl_parser_extras.h
@@ -102,7 +102,7 @@
 			       const char *fmt, ...);
 
 extern "C" {
-extern int preprocess(void *ctx, const char **shader);
+extern int preprocess(void *ctx, const char **shader, char **info_log);
 }
 
 extern void _mesa_glsl_lexer_ctor(struct _mesa_glsl_parse_state *state,