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
@@ -530,7 +530,6 @@ set (all_C_and_CXXSRCS
 
 set (TOP_LEVEL_RESOURCES
   cty.dat
-  icons/Darwin/JS8Call.iconset/icon_128x128.png
   contrib/gpl-v3-logo.svg
   artwork/splash.png
   )
