Bug#51949 - make_binary_distribution fails on Mac.

Unquoted ${CMAKE_CPACK_COMMAND} is used in this script.
This variable resolves to cpack's real path with spaces, e.g
 /Applications/CMake 2.6.4-app/Contents/bin/cpack. 
Script fails due to lack of quotes.

Fix is to use quotes around ${CMAKE_CPACK_COMMAND}.

scripts/CMakeLists.txt

@@ -65,7 +65,7 @@ ADD_CUSTOM_TARGET(GenFixPrivs
 
 IF(UNIX)
  FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/make_binary_distribution 
-   "cd ${CMAKE_BINARY_DIR} && ${CMAKE_CPACK_COMMAND} -G TGZ --config CPackConfig.cmake" )
+   "cd ${CMAKE_BINARY_DIR} && '${CMAKE_CPACK_COMMAND}' -G TGZ --config CPackConfig.cmake" )
  EXECUTE_PROCESS(
   COMMAND chmod +x ${CMAKE_CURRENT_BINARY_DIR}/make_binary_distribution
 )