[physfs] Re: more warnings

[Ryan C. Gordon]

> I've seen this warning before in other projects "dereferencing
> type-punned pointer will break strict-aliasing rules" (wxWidgets
> specifically), but anything I've built seemed to work fine so I
> wouldn't worry about it.

It works fine until it doesn't. It's actually a serious warning, because 
99% of the time, the code works right, but the 1% that it fails, it 
looks like the compiler generated incorrect code (hey, it warned you!).

Usually my Windows work has been with MSVC, and it is strict about 
different things that GCC. I'll look into this.

--ryan.