[chronojump] Sound error message now only on Linux (was for all systems on last commits)

[Xavier de Blas <xaviblas src gnome org>]

commit 70baafbfeb5696b5848afd23c4f4943063dbf8fa
Author: Xavier de Blas <xaviblas gmail com>
Date:   Mon Dec 22 11:55:07 2014 +0100

    Sound error message now only on Linux (was for all systems on last commits)

 src/gui/chronojump.cs |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/src/gui/chronojump.cs b/src/gui/chronojump.cs
index def715e..48df4c5 100644
--- a/src/gui/chronojump.cs
+++ b/src/gui/chronojump.cs
@@ -3115,11 +3115,12 @@ public partial class ChronoJumpWindow
                        
                        //on Linux put volumeOn on false on start because there's a bug on Mono and audio
                        //https://github.com/mono/mono/pull/1376
-                       new DialogMessage(Constants.MessageTypes.WARNING, 
-                                       "There's an audio problem with Mono on Linux.\n" +
-                                       "We recommend to have sound disabled. More info:\n" +
-                                       "https://github.com/mono/mono/pull/1376";
-                                       );
+                       if(UtilAll.GetOSEnum() == UtilAll.OperatingSystems.LINUX)
+                               new DialogMessage(Constants.MessageTypes.WARNING, 
+                                               "There's an audio problem with Mono on Linux.\n" +
+                                               "We recommend to have sound disabled. More info:\n" +
+                                               "https://github.com/mono/mono/pull/1376";
+                                               );
                } else {
                        preferences.volumeOn = false;
                        SqlitePreferences.Update("volumeOn", "False", false);