w32api-2.4: patch to update HID support

Hi,

I had some problems writing code to talk to Human 
Interface Device (HID) USB clients.

I found that this was because I needed a number of 
exports defined for libhid.a, and an associated include 
file to prototype these.

Looking in the w32api source I saw that the relevant 
functions were commented out in lib/ddk/hid.def. I 
modified this to put the needed exports back in with 
appropriate suffixes.

I also added include/hidsdi.h to prototype the exports.

I've put together a patch against what I believe is the 
the current release of the w32api (2.4). 

Would it be possible to integrate into the next release?

Thanks,

Alex/