[gobject-introspection] Fix a bison deprecation warning for using %error-verbose

[Christoph Reiter <creiter src gnome org>]

commit 3eb5b8b1051d101a9653a2b0b7d4dc8b85bfca89
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Wed Dec 11 19:12:08 2019 +0100

    Fix a bison deprecation warning for using %error-verbose
    
    warning: deprecated directive, use ‘%define parse.error verbose’

 giscanner/scannerparser.y | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/giscanner/scannerparser.y b/giscanner/scannerparser.y
index decd0f2b..269a7bd3 100644
--- a/giscanner/scannerparser.y
+++ b/giscanner/scannerparser.y
@@ -246,7 +246,7 @@ set_or_merge_base_type (GISourceType *type,
 
 %}
 
-%error-verbose
+%define parse.error verbose
 %union {
   char *str;
   GList *list;