[gnome-continuous] Do not build man pages for Seahorse

[Emmanuele Bassi <ebassi src gnome org>]

commit 8a3dc097647f3a54084d3f6306aec9731e434ae8
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sun Mar 17 23:42:36 2019 +0000

    Do not build man pages for Seahorse
    
    Explicitly set the `manpages` option to false, in case the default
    changes again.

 manifest.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/manifest.json b/manifest.json
index 2540cae..3d69faf 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1353,7 +1353,8 @@
                      "-Dpgp-support=false",
                      "-Dcheck-compatible-gpg=false",
                      "-Dldap-support=false",
-                     "-Dkey-sharing=false"
+                     "-Dkey-sharing=false",
+                     "-Dmanpage=false"
                  ]},
 
                {"src": "gnome:totem.git",