Exception when fcntl not availalbe on non Win32

[Bug Importer]

The file zope/lib/python/ZODB/lock_file.py attempts to load the fcntl module. If this fails, and the machine is *NOT* Win32, then control flow will procede to statements that *require* the Win32 modules. The addition of a simple 'else' clause to the try statement that loads the win32 modules fixes theproblem.

[Hanno Schlichting (hannosch)]

The fcntl module isn't used anymore in current ZODB3.