Matthias Krüger
67e52b9f92
bootstrap: only build `crt{begin,end}.o` when compiling to MUSL
only MUSL needs those objects and trying to compile them to other targets, e.g. Windows or macOS, will produce C compilation errors
check the target before shelling out to the C compiler and tweak `make_run` to skip the actual C compilation when the target is not MUSL
fixes #135782
see the linked issue for additional context
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