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Stop linking rs{begin,end} objects on x86_64-*-windows-gnu
Until now, x86_64-pc-windows-gnu linked `rsbegin.o` and `rsend.o` just like i686-pc-windows-gnu, even though they were no-ops for it. This was likely done for the simplicity back when it was introduced.
Today the things are different and these startup/end objects harm other features, like `build-std`. Given the demotion of i686-pc-windows-gnu from tier 1, there is no point in hurting x86_64-pc-windows-gnu, which remains a tier 1.
The files are still shipped in case downstream crates expect them, as in case of the unmaintained `xargo`.
Fixes https://github.com/rust-lang/rust/issues/146739
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.