cmake: fix package generation on Mac OS X
cmake: add vendor-specific packaging extension point
cmake: remove debug output
Merge branch 'master' of git://github.com/awakecoding/FreeRDP

# By Marc-André Moreau
# Via Marc-André Moreau
* 'master' of git://github.com/awakecoding/FreeRDP:
  cmake: remove debug output
  cmake: add vendor-specific packaging extension point
  cmake: fix package generation on Mac OS X
Caching CMAKE_OSX_DEPLOYMENT_TARGET variable to prevent error on subsequent compilations