macOS: Do not pass Apple-specific flags to llvm-strip
Since commit cf82300a63 (BinUtils: Clarify search logic and make it more
consistent, 2021-05-27, v3.21.0-rc1~119^2~2) we prefer `llvm-strip` over
`strip` when using Clang. However, since commit 20291e8e72 (install:
Fix stripping on macOS, 2019-01-30, v3.14.0-rc1~31^2) on macOS we add
flags `-u -r`, needed by Apple's `strip` for executables, but that
`llvm-strip` does not need or support. Improve the condition to add
Apple-specific flags only when the selected `strip` tool is Apple's.
Note that Apple dylibs must be stripped with `-x` with either Apple's
`strip` or `llvm-strip`.
Fixes: #24601
4 files changed
