[gcj-eclipse-merge-branch] make park/unpark stuff build on win32

[Andrew Haley]

Adam Megacz writes:
 > 
 > 
 > ok to commit?
 > 
 >   - a

No.  This removes the creation/destruction of park_mutex and park_cond.

Shouldn't 

  pthread_mutex_init (&nt->park_mutex, NULL);

be replaced by something like

  _Jv_MutexInit (&nt->park_mutex);

and that would work on Win32?

Andrew.