dist: Ensure UEFI rlibs are all COFF

If clang isn't the C compiler used for the UEFI targets, or if the wrong
`--target` is passed to clang, we will get ELF objects in some
rlibs. This will cause problems at link time when trying to compile a
UEFI program that uses any of those objects. Add a check to the dist
step for UEFI targets that reads each rlib with the `object` crate and
fails with an error if any non-COFF objects are found.

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