Allow using using windows-gnu target without rust-mingw component

[mati865]

It would fix rust-lang/rust#47048

TL;DR
rust-mingw contains set of libraries compiled with specific versions of GCC and mingw-w64 and have higher priority then system libraries. This causes mismatch between headers and libraries when host toolchain is different than one used by Rust.

Removing it isn't possible now:

rustup : error: component 'rust-mingw' for target 'x86_64-pc-windows-gnu' is required for toolchain 'stable-x86_64-pc-windows-gnu' and cannot be removed

To fix this issue 2 things are necessary:

• ability to remove rust-mingw component
• option to install windows-gnu without rust-mingw component

[crlf0710]

This alone won't be enough. We'll need to point the linker to use the correct crt2.o and dllcrt2.o file too...

[crlf0710]

rust-lang/rust#53454

[mati865]

Linker should inherit host cc library paths but it's not related to rustup repo. niedz., 9 gru 2018, 08:31: CrLF0710 <notifications@github.com> napisał(a):

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