Base work for Windows compatibility

[weltling]

This includes

• catch up with config.w32 and makefile
• using minilua to generate the C file with JIT implementation
• surrogate implementations for __builtin_ctz/__builtin_clz
• other fixes for build without global registers, exporting symbols, etc.

The JIT functionality is still untouched, so needs to be implemented. Also the disasm functionality for dumping JIT code is excluded for now, as it would require some hand made or library code to read symbols from COFF files. Still, the changes in this patch will help to ramp up the missing functionality.

Thanks.