[vala/staging] glib-2.0: Add string.validate_len() since 2.60

[Rico Tzschichholz <ricotz src gnome org>]

commit f3b5ce8e8ce03fcb0169169563bf8e5269504e50
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Fri Mar 15 07:49:50 2019 +0100

    glib-2.0: Add string.validate_len() since 2.60

 vapi/glib-2.0.vapi | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/vapi/glib-2.0.vapi b/vapi/glib-2.0.vapi
index 44e11df64..7aad7bc73 100644
--- a/vapi/glib-2.0.vapi
+++ b/vapi/glib-2.0.vapi
@@ -1260,6 +1260,9 @@ public class string {
        public string reverse (ssize_t len = -1);
        [CCode (cname = "g_utf8_validate")]
        public bool validate (ssize_t max_len = -1, out char* end = null);
+       [Version (since = "2.60")]
+       [CCode (cname = "g_utf8_validate_len")]
+       public bool validate_len (size_t max_len, out char* end = null);
        [Version (since = "2.52")]
        [CCode (cname = "g_utf8_make_valid")]
        public string make_valid (ssize_t len = -1);