Fix libstd compile error for windows-gnu targets without backtrace
#45739
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Fix libstd compile error for windows-gnu targets without `backtrace` This is basically an addition to rust-lang#44979. Compiling `libstd` still fails when targeting `windows-gnu` with `panic = "abort"` because the items in the `...c::gnu` module are not used. They are only referenced from `backtrace_gnu.rs`, which is indirectly feature gated behind `backtrace` [here](https://github.com/rust-lang/rust/blob/9f3b09116b742b2606dc5f36f9145e0c89e4010b/src/libstd/sys/windows/mod.rs#L23).
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This is basically an addition to #44979. Compiling
libstdstill fails when targetingwindows-gnuwithpanic = "abort"because the items in the...c::gnumodule are not used. They are only referenced frombacktrace_gnu.rs, which is indirectly feature gated behindbacktracehere.