Add `os::windows::ffi::OsStrExt::system_cmp` and `system_eq`#86008

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CDirkx wants to merge 2 commits intorust-lang:masterfrom

CDirkx:windows-case-insensitive

Commits on Jun 4, 2021

Add `sys::windows::compare_case_insensitive`
CDirkx
committed

Commits on Jun 5, 2021

Add `os::windows::ffi::OsStrExt::system_cmp` and `system_eq`
CDirkx
committed