[balsa] Use documented option syntax for msgfmt

[Peter Bloomfield <peterb src gnome org>]

commit 7ecfaca151a7d155d3aaa8e835899a2a1ddbea73
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Fri Sep 22 10:44:45 2017 -0400

    Use documented option syntax for msgfmt
    
        * sounds/meson.build: use documented option syntax for msgfmt.

 ChangeLog          |    4 ++++
 sounds/meson.build |    8 ++++----
 2 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 22065c9..992faa1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2017-09-22  Peter Bloomfield  <pbloomfield bellsouth net>
+
+       * sounds/meson.build: use documented option syntax for msgfmt.
+
 2017-09-21  Peter Bloomfield  <pbloomfield bellsouth net>
 
        Replace 'yes'|'no' option values inherited from autotools with
diff --git a/sounds/meson.build b/sounds/meson.build
index f0934d8..8966b3d 100644
--- a/sounds/meson.build
+++ b/sounds/meson.build
@@ -21,7 +21,7 @@ custom_target('soundlist-file',
               install     : true,
               install_dir : sound_list_dir,
               command     : ['msgfmt', '--desktop',
-                             '--keyword',     'description',
-                             '--template',    '@INPUT@',
-                             '-d',             join_paths(meson.current_source_dir(), '../po'),
-                             '--output-file', '@OUTPUT@'])
+                             '--keyword=description',
+                             '--template=@INPUT@',
+                             '-d', join_paths(meson.current_source_dir(), '../po'),
+                             '--output-file=@OUTPUT@'])