Make rustc implicitly use panic=abort for the panic_abort crate #140254
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The panic_abort crate must be compiled with panic=abort, but cargo doesn't allow setting the panic strategy for a single crate. Bootstrap handles this in its rustc wrapper, but for example the build systems of cg_clif and cg_gcc don't use a rustc wrapper, so they would either need to add one or be unable to build a sysroot suitable for both panic=abort and panic=unwind (as is currently the case).
There is a crate called panic_abort on crates.io that would also be affected by this change. This crate uses unstable features and has last been updated in 2019 however and seems to be meant to be used when you want panic=abort behavior anyway.
Required for rust-lang/rustc_codegen_cranelift#1567