wgl: Implement wglGetPixelFormatAttribfvARB

[Chris Robinson]

An implementation for wglGetPixelFormatAttribfvARB, which basically just calls 
the integer-array equivilant and converts the results to float. IMO, it would 
probably be better to put the actual code into the float-array function and 
make the integer-array one piggyback and convert, as this would make it 
easier to follow spec and keep the code clean, but I haven't noticed anything 
that can return a non-whole number so there's currently no difference.
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