Revert "rts: Drop redundant flags for libffi"
Revert "rts: Drop redundant flags for libffi"

This seems to have regressed builds using `--with-system-libffi`
(#17520).

This reverts commit 3ce18700f80a12c48a029b49c6201ad2410071bb.

sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc