WinNTL-11_5_1: Support for MINGW / static GMP library

[TGrosser2]

1. Compiling and performing checks manually is time expensive.
   Is there a ´configure´ script for MINGW, which does the hardware acceleration checks?
   Is alternatively the unix release suitable for MINGW?

2. The generator for gmp configuration header gmp_aux.h assumes dynamic linkeage the gmp lib
   Is statically linking gmp basically supported?