[jhbuild] Try fixing build.

[Arnaud Bonatti <arnaudb src gnome org>]

commit 2dc9e18bfcf0c8312f94caee105179cf970320c6
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Thu Mar 1 12:26:16 2018 +0100

    Try fixing build.

 modulesets/gnome-suites-core-deps-3.28.modules |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modulesets/gnome-suites-core-deps-3.28.modules b/modulesets/gnome-suites-core-deps-3.28.modules
index 869b471..7f0f102 100644
--- a/modulesets/gnome-suites-core-deps-3.28.modules
+++ b/modulesets/gnome-suites-core-deps-3.28.modules
@@ -849,7 +849,7 @@ the module and we will just change it to use a tarball anyway.
     <if condition-set="quartz">
       <mesonargs value="-Denable-quartz-backend=true"/>
     </if>
-    <branch repo="gitlab.gnome.org"/>
+    <branch repo="gitlab.gnome.org" checkoutdir="gtk+" module="GNOME/gtk.git"/>
     <dependencies>
       <dep package="atk"/>
       <dep package="glib"/>