The "Gestalt" function on OSX is deprecated (starting with OSX 10.8),
remove its usage from the stdlib. The patch removes a number of private
functions and a private module, but does not change the public API.

The removed code was effectively dead, the platform module has used
other code to fetch the OSX version for years and could only use
on the Gestalt-based code as a fallback. That fallback can only trigger
on broken OSX installs (that is, someone has removed parts of the system
install)

Févry Thibault.

Févry Thibault.

Phil Webster. With that available, modify RstripExtension.py to stop deleting
null slices, which caused a file to be marked as changed when it was not.

Based on patches by Todd.Rovito and Phil Webster.

Initial patch by Madison May.

Initial patch by Madison May.

There is more to be done here in terms of accepting RFC invalid
input that some mailers accept, but this covers the valid
RFC places where encoded words can occur in structured headers.