linux_like: add SIGEMT for mips* and sparc* #4730
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(backport rust-lang#4730) (cherry picked from commit de7e184)
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Description
While SIGEMT doesn't exist for most Linux platforms, mips and sparc have it.
This should also remove Rustix's need to import SIGEMT from linux-raw-sys.
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Checklist
libc-test/semverhave been updated*LASTor*MAXareincluded (see #3131)
cd libc-test && cargo test --target mytarget);especially relevant for platforms that may not be checked in CI
@rustbot label +stable-nominated