meson: explicitly disallow unsupported build directory layout

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2512
Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3832>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3832>
1 file changed