[gthumb] don't use functions not available in glib 2.36

[Paolo Bacchilega <paobac src gnome org>]

commit 9e8d99964ea3beacdb03ddc50b216d88b204fc6e
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Mar 29 19:46:13 2015 +0200

    don't use functions not available in glib 2.36

 gthumb/glib-utils.c |    8 ++++++++
 gthumb/glib-utils.h |    2 ++
 gthumb/gth-main.c   |    2 +-
 3 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/gthumb/glib-utils.c b/gthumb/glib-utils.c
index cd74a8f..7d4dd15 100644
--- a/gthumb/glib-utils.c
+++ b/gthumb/glib-utils.c
@@ -1319,6 +1319,14 @@ _g_strv_find (char       **v,
 }
 
 
+gboolean
+_g_strv_contains (char       **v,
+                 const char  *s)
+{
+       return (_g_strv_find (v, s) >= 0);
+}
+
+
 char **
 _g_strv_prepend (char       **str_array,
                  const char  *str)
diff --git a/gthumb/glib-utils.h b/gthumb/glib-utils.h
index af3b340..5a9d76c 100644
--- a/gthumb/glib-utils.h
+++ b/gthumb/glib-utils.h
@@ -211,6 +211,8 @@ const char *    get_static_string                (const char  *s);
 char *          _g_rand_string                   (int          len);
 int             _g_strv_find                     (char       **v,
                                                  const char  *s);
+gboolean        _g_strv_contains                 (char       **v,
+                                                 const char  *s);
 char **         _g_strv_prepend                  (char       **str_array,
                                                  const char  *str);
 char **         _g_strv_concat                   (const char *const *strv1,
diff --git a/gthumb/gth-main.c b/gthumb/gth-main.c
index 4a70138..3f4ff45 100644
--- a/gthumb/gth-main.c
+++ b/gthumb/gth-main.c
@@ -1277,7 +1277,7 @@ gth_main_activate_extensions (void)
                GthExtensionDescription *description;
                GError                  *error = NULL;
 
-               mandatory = g_strv_contains (mandatory_extensions, name);
+               mandatory = _g_strv_contains (mandatory_extensions, name);
                description = gth_extension_manager_get_description (manager, name);
                if (! mandatory && (description != NULL) && description->hidden)
                        continue;