hidparse: wrong function signatures

At least the following functions use PULONG instead of PUSHORT:

• HidP_GetSpecificValueCaps
• HidP_GetSpecificButtonCaps

Needs to be fixed in lots of places... headers and such. Might be good to try and build hidparse with MS's headers to easily find differences.

Found by... guess what, removing a should-be-unnecessary cast (in HidP_GetButtonCaps).