[gtk-mac-bundler] Add NSHighResolutionCapable key to Info.plist.

[John Ralls <jralls src gnome org>]

commit e59b12285db89b732d599d0040d61626a09e2ee2
Author: John Ralls <jralls ceridwen us>
Date:   Sat Jun 17 17:13:26 2017 -0700

    Add NSHighResolutionCapable key to Info.plist.

 examples/Info-gtk-demo.plist |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/examples/Info-gtk-demo.plist b/examples/Info-gtk-demo.plist
index 966042c..39dee0c 100644
--- a/examples/Info-gtk-demo.plist
+++ b/examples/Info-gtk-demo.plist
@@ -28,6 +28,7 @@
     <string>10.4</string>
     <key>GtkOSXLaunchScriptFile</key>
     <string>gtk_launcher.py</string>
-
+    <key>NSHighResolutionCapable</key>
+    <true/>
 </dict>
 </plist>