Cross compile fixes for msvcrt

[Hans Leidekker]

This patch prefixes many more functions, types, structs, etc. with
MSVCRT_ to avoid conflicts with MinGW standard includes.

It's a big patch though basically it's a noop (but for the 
prototype correction), so I think it's justified.

 -Hans

Changelog:
  - Prefix many more functions, types, structs, etc. with MSVCRT_
  - Correct prototypes for _memccpy()/_memicmp()
  - "define before use" reordering in file.c
  - Use the new math.h/float.h

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