-
Brad King authored
MSYS2 and similar MinGW/MSYS distributions define development environments with a `MSYSTEM` environment variable. Each such environment has a documented installation prefix for its packages, often provided by a `MSYSTEM_PREFIX` environment variable. Since commit 84a25fc2 (cmake_host_system_information: Add MSYSTEM_PREFIX query, 2023-09-08) we can look up this prefix. Add `$MSYSTEM_PREFIX/local` and `$MSYSTEM_PREFIX` to our system search prefixes when targeting MinGW under `MSYSTEM` environments. This is their equivalent to `/usr/local` and `/usr`, which we search by default on UNIX systems. Issue: #24216
5e5132e1