[nautilus] Bump gtk_minver for GtkPopoverMenu

[Carlos Soriano Sánchez <csoriano src gnome org>]

commit aa02937eb72613efc53549ab72c2b6e0032426f7
Author: Nelson Benítez León <nbenitezl+gnome gmail com>
Date:   Sun Feb 22 12:42:44 2015 +0500

    Bump gtk_minver for GtkPopoverMenu
    
    https://bugzilla.gnome.org/show_bug.cgi?id=744935

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 7d29886..1a14815 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,7 @@ dnl ===========================================================================
 m4_define(glib_minver,                 2.43.4)
 m4_define(gnome_desktop_minver,        3.0.0)
 m4_define(pango_minver,                1.28.3)
-m4_define(gtk_minver,                  3.13.2)
+m4_define(gtk_minver,                  3.15.2)
 m4_define(xml_minver,                  2.7.8)
 m4_define(exif_minver,                 0.6.20)
 m4_define(exempi_minver,               2.1.0)