Remove Darwin icon from TOP_LEVEL_RESOURCES because it's also matched by
Files-Excluded in debian/copyright and hence isn't part of the orig tarball.

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -405,7 +405,6 @@
 
 set (TOP_LEVEL_RESOURCES
   cty.dat
-  icons/Darwin/JS8Call.iconset/icon_128x128.png
   contrib/gpl-v3-logo.svg
   artwork/splash.png
   )
