Auto merge of #76381 - petrochenkov:nomingwcomp, r=Mark-Simulacrum

Auto merge of #76381 - petrochenkov:nomingwcomp, r=Mark-Simulacrum

rustbuild: Do not use `rust-mingw` component when bootstrapping windows-gnu targets

Addresses https://github.com/rust-lang/rust/pull/76326#issuecomment-687273473 (ancient `x86_64-w64-mingw32-gcc` is selected as a linker wrapper, which is not usable in `use_lld=true` mode).

Perhaps the comment about incompatible mingw was true in the past, but many things changed since then.
With this change I was able to build everything successfully locally using a newer mingw toolchain, if it passes through the older toolchain on CI, then it should be good, I think.