File locking code doesn't work under Windows

[vanstyn]

File locking is used for thread safety, however, the code does not work in Windows:

https://github.com/vanstyn/Catalyst-Controller-AutoAssets/blob/v0.25/lib/Catalyst/Controller/AutoAssets/Handler.pm#L567-L586

This needs to be replaced with a cross-platform method that is just as effective (wait/block)

[vanstyn]

This was attempted to be fixed by #2 but this just created another windows bug and still doesn't work in Windows