rustbuild: Fix --enable-rpath usage #32903
Merged
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This commit fixes the
--enable-rpath
configure flag in rustbuild to workdespite the compile-time directories being different than the runtime
directories. This unfortunately means that we can't use
-C rpath
out of thebox but hopefully the portability story here isn't too bad as
src/librustc_back/rpath.rs
isn't too complicated.Closes #32886