Hopefully fix linking on Windows and Mac OS X.

But given how badly broken the plugin is (interaction stuff),
you'd better not use it anyway.

Replaces gotos with #defines
Put duplicate code in #defines
Disables plugin by default

* Remove some unneeded wrappers and locking

Add "shuffle" button to puzzle in order to prevent shuffling when double clicking to go fullscreen once the puzzle is solved.

- access/file.c: fixed stat on win32, make sure the right stat structure is used, 'struct _stati64' on win32 and not 'struct stat'