[gnome-continuous] gvfs: disable mtp backend and volume monitor support

[Iñigo Martínez <inigomartinez src gnome org>]

commit 961b1b30fb5dd7feb55104c0051052ae0a4f2b0a
Author: Iñigo Martínez <inigomartinez gmail com>
Date:   Thu Apr 5 20:26:01 2018 +0200

    gvfs: disable mtp backend and volume monitor support
    
    The image used in gnome-continuous does not have support for
    the `libmtp` library, which is necessary for the `mtp` backend
    and the volume monitor support.
    
    Due to this missing library, the `mtp` backend and volume monitor
    support are disabled.

 manifest.json |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index 3922f6d..51e606d 100644
--- a/manifest.json
+++ b/manifest.json
@@ -851,6 +851,7 @@
                                  "-Dgoogle=false",
                                  "-Dgphoto2=false",
                                  "-Dlibusb=false",
+                                 "-Dmtp=false",
                                  "-Dsmb=false"]},
 
                {"src": "gnome:gnome-bluetooth",