[gnome-software/gnome-3-26] trivial: allow dist'ing with no gnome-software installed

[Joaquim Rocha <jrocha src gnome org>]

commit 49593faf67b6bf02e33e8027b6004ae394fc25d3
Author: Richard Hughes <richard hughsie com>
Date:   Tue Sep 5 11:52:08 2017 +0100

    trivial: allow dist'ing with no gnome-software installed
    
    Fixes:
    
        GLib-GIO-ERROR **: Settings schema 'org.gnome.software' does not contain a
        key named 'external-appstream-system-wide'

 plugins/flatpak/gs-self-test.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/plugins/flatpak/gs-self-test.c b/plugins/flatpak/gs-self-test.c
index 7090bf82..c8ad3d4a 100644
--- a/plugins/flatpak/gs-self-test.c
+++ b/plugins/flatpak/gs-self-test.c
@@ -1480,6 +1480,10 @@ main (int argc, char **argv)
        g_setenv ("G_MESSAGES_DEBUG", "all", TRUE);
        g_setenv ("GS_SELF_TEST_FLATPAK_DATADIR", tmp_root, TRUE);
 
+       /* allow dist'ing with no gnome-software installed */
+       if (g_getenv ("GS_SELF_TEST_SKIP_ALL") != NULL)
+               return 0;
+
        /* ensure test root does not exist */
        if (g_file_test (tmp_root, G_FILE_TEST_EXISTS)) {
                ret = gs_utils_rmtree (tmp_root, &error);