Brad King 6e63080d39 macOS: Restore RPATH entry for libraries linked from /usr/local/lib ...

Since commit 7b19531291 (macOS: Do not pass any SDK/-isysroot to
compilers by default, 2024-11-06, v4.0.0-rc1~511^2) our default
invocation of compilers targeting macOS no longer passes `-isysroot`.
Without that, Xcode's compilers search `-L/usr/local/lib` by default
even though the macOS dynamic loader does not.  Since `/usr/local/lib`
is not a fully-implemented implicit link directory, exclude it from our
detected `CMAKE_<LANG>_IMPLICIT_LINK_LIBRARIES` so that our generators
do not suppress `RPATH` entries for dependencies in that directory.

Fixes: #26867

2025-04-15 14:13:45 -04:00

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