[compiler-rt] [compiler-rt] Remove %T from shared object substitutions (PR #155302)

[Florian Mayer via llvm-commits]

https://github.com/fmayer commented:

IMO it would be less magic to explicitly build into %t.dir and then lass -L%t.dir manually as well. But this is OK as well.

https://github.com/llvm/llvm-project/pull/155302