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9abcaefd51
Remove requirement for --target when invoking Cargo with -Zbuild-std This PR addresses [this issue](https://github.com/rust-lang/wg-cargo-std-aware/issues/25) re: build-std stabilization. We believe the requirement for --target to be specified when invoking cargo with -Zbuild-std, from our testing, is no longer needed. Now, with this change, by default Cargo will use the Host CompileKind, rather than a manually specified CompileTarget. We propose removing this restriction in order to test this more widely. Our own testing is detailed below. This change has been tested in the following manner: * Building crates depending on proc_macro, std, and build scripts (which themselves depend on proc_macro) * Various RUSTFLAGS, such as `-Zsanitizer=cfi`, `-Cembed-bitcode=yes`, `-Cforce-frame-pointers`, `-Cforce-unwind-tables=yes`, `-Csoft-float=yes`, `-Zbranch-protection=pac-ret`.