| ## All directory options now support paths outside of prefix |
| |
| Previously, Meson only allowed most directory options to be relative to prefix. |
| This restriction has been now lifted, bringing us in line with Autotools and |
| CMake. It is also useful for platforms like Nix, which install projects into |
| multiple independent prefixes. |
| |
| As a consequence, `get_option` might return absolute paths for any |
| directory option, if a directory outside of prefix is passed. This |
| is technically a backwards incompatible change but its effect |
| should be minimal, thanks to widespread use of `join_paths`/ |
| `/` operator and pkg-config generator module. |
