[avr-gcc-list] build srecord under mingw

[Gene Smith]

Srecord, part of winarv, seems to be built under mingw. I can build the 
latest version of srecord (with a few mods) under linux but in mingw I 
also need the "boost" library which does not seem to be a part of mingw 
packages and I don't see it in winavr installed files (I don't think). 
How is this done in the winarvr build?

Also, is the complete winavr build method documented?

Thanks,
-gene