compiler.tests.alien: get it passing when VM is compiled with MINGW by disabling certain tests and using the MINGW ABI for others, and fix fastcall alien-indirect tests for name decoration
compiler.tests.alien: get it passing when VM is compiled with MINGW by disabling certain tests and using the MINGW ABI for others, and fix fastcall alien-indirect tests for name decoration

mcandre/factor,erg/factor,mcandre/factor,erg/factor,kingcons/factor,ceninan/factor,ceninan/factor,ceninan/factor,cataska/factor,erg/factor,kingcons/factor,cataska/factor,ceninan/factor,mcandre/factor,erg/factor,erg/factor,erg/factor,mcandre/factor,erg/factor,mcandre/factor,mcandre/factor,mcandre/factor,cataska/factor,cataska/factor,kingcons/factor,kingcons/factor