[gnome-builder] build: take webkit2gtk-4.0 2.12 as a dependency

[Christian Hergert <chergert src gnome org>]

commit 7e45d23965f0613032dbe20da6ace4c840ba6ff1
Author: Christian Hergert <christian hergert me>
Date:   Wed Apr 13 18:36:10 2016 -0700

    build: take webkit2gtk-4.0 2.12 as a dependency
    
    Various plugins really don't like to be initializing webkit from inside
    their compartment, so just take a webkit dependency at the toplevel. This
    will make it harder for some systems to build (OSX, etc), but I'm not all
    that concerned. It's more important to me that this starts working now.

 configure.ac |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e8d6008..6ec15cb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -180,6 +180,7 @@ m4_define([pygobject_required_version], [3.19.3])
 m4_define([libxml_required_version], [2.9.0])
 m4_define([pangoft2_required_version], [1.38.0])
 m4_define([peas_required_version], [1.18.0])
+m4_define([webkit_required_version], [2.12.0])
 
 PKG_CHECK_MODULES(EGG,      [glib-2.0 >= glib_required_version
                              gmodule-2.0 >= glib_required_version
@@ -194,7 +195,8 @@ PKG_CHECK_MODULES(LIBIDE,   [gio-2.0 >= glib_required_version
                              gtksourceview-3.0 >= gtksourceview_required_version
                              libpeas-1.0 >= peas_required_version
                              libxml-2.0 >= libxml_required_version
-                             pangoft2 >= pangoft2_required_version])
+                             pangoft2 >= pangoft2_required_version
+                             webkit2gtk-4.0 >= webkit_required_version])
 PKG_CHECK_MODULES(NAUTILUS, [glib-2.0 >= glib_required_version
                              gtk+-3.0 >= gtk_required_version])
 PKG_CHECK_MODULES(PANEL_GTK,[gtk+-3.0 >= gtk_required_version])