[gvfs] build: Fix missing GDU monitor service file

[Ondrej Holy <oholy src gnome org>]

commit d43a3b9ddb5cb1409613788934b82e23514383f9
Author: Iñigo Martínez <inigomartinez gmail com>
Date:   Tue Oct 31 12:16:14 2017 +0100

    build: Fix missing GDU monitor service file
    
    The GDU monitor service file is not created properly due to missing
    service name variable declaration.
    
    This patch adds the variable declaration which fixes the problem.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786149

 monitor/gdu/meson.build |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/monitor/gdu/meson.build b/monitor/gdu/meson.build
index 86ddd3d..653faeb 100644
--- a/monitor/gdu/meson.build
+++ b/monitor/gdu/meson.build
@@ -5,6 +5,8 @@ install_data(
   install_dir: gvfs_remote_volume_monitors_dir
 )
 
+service = gvfs_namespace + '.GduVolumeMonitor.service'
+
 gdu_service = configure_file(
   input: service + '.in',
   output: service,