linux about: Show when we're an xdg-app

SparkleShare/Linux/About.cs

@@ -16,6 +16,8 @@
 
 
 using System;
+
+using Sparkles;
 using Gtk;
 
 namespace SparkleShare {
@@ -102,6 +104,9 @@ namespace SparkleShare {
                 Xalign = 0, Xpad = 0
             };
 
+            if (InstallationInfo.Directory.Equals ("/app"))
+                version.Text += " (xdg-app)";
+
             version.StyleContext.AddProvider (label_css_provider, 800);
 
             updates = new Label ("Checking for updates…") {

SparkleShare/Mac/UserInterface/SetupWindow.cs

@@ -15,7 +15,6 @@
 //   along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 
-using System;
 using System.Collections.Generic;
 using System.Drawing;
 

configure.ac

@@ -131,7 +131,7 @@ echo "
 SparkleShare ${VERSION}
 
 Configuration:
-       Prefix : ${prefix}
+       Prefix: ${prefix}
 
 "