Drone FreeBSD failures (warnings, segfault, missing _ZTIDu)

I have trouble with FreeBSD on Drone and would need a hand:

- `job(compiler='clang-10', cxxstd='11,14,17,20', os='freebsd-13.1')` works but [throws warnings](https://drone.cpp.al/boostorg/locale/25/11/2) for system headers in `/usr/local`
- `job(compiler='clang-15', cxxstd='11,14,17,20', os='freebsd-13.1')` [fails at runtime](https://drone.cpp.al/boostorg/locale/25/12/2) with `Undefined symbol "_ZTIDu"`
- `job(compiler='gcc-11', cxxstd='11,14,17,20', os='freebsd-13.1', linkflags='-Wl,-rpath=/usr/local/lib/gcc11')` [fails at runtime](https://drone.cpp.al/boostorg/locale/25/13/2) with a seg fault

Any idea how to solve or even approach this without a local FreeBSD?