[gupnp-tools] Add --add-comments to XGETTEXT_OPTIONS in Makevars

[Piotr Drąg <piotrdrag src gnome org>]

commit 2c817343f8687fc7a1db6a72a72d8a20c7ef02e7
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sun Aug 21 15:02:59 2016 +0200

    Add --add-comments to XGETTEXT_OPTIONS in Makevars
    
    So that comments from .desktop files appear in the .po files.

 po/Makevars |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/po/Makevars b/po/Makevars
index df09a7b..0c4f2a3 100644
--- a/po/Makevars
+++ b/po/Makevars
@@ -8,7 +8,7 @@ subdir = po
 top_builddir = ..
 
 # These options get passed to xgettext.
-XGETTEXT_OPTIONS = --keyword=_ --keyword=N_ --from-code=UTF-8
+XGETTEXT_OPTIONS = --keyword=_ --keyword=N_ --from-code=UTF-8 --add-comments
 
 # This is the copyright holder that gets inserted into the header of the
 # $(DOMAIN).pot file.  Set this to the copyright holder of the surrounding