Looking to make a GDC-12 mingw64 package

[Preetpal]

> The second issue was that the compilation of GCC did not work 
> for version gcc-11.2.0 on my version of MinGW. Many of the 
> configure flags resulted in warnings in the configure process 
> since they were not recognized (should these flags be in the 
> configure command?):
>
> ```
> configure: WARNING: unrecognized options: --disable-bootstrap, 
> --disable-werror, --disable-libgomp, --disable-libmudflap, 
> --disable-libquadmath, --disable-libitm, 
> --disable-libsanitizer, --disable-libstdcxx-pch, --with-arch, 
> --with-gmp, --with-mpfr, --with-mpc, --with-isl, 
> --enable-libphobos
> ```

These are probably from the configure flags shown when running 
`gcc --version`. When I use the same configure flags as the build 
of gcc I am using, I also get the warning for unrecognized 
options.