[flang] Fix building on aarch64 *BSD and musl libc after 9d8dc45d17088300e9e2086594ca581b119193c8#125183

brad0 merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

brad0:flang_fpu_controlbrad0/llvm-project:flang_fpu_controlCopy head branch name to clipboard