Upstream meson-build.sh was recently updated (Mesa commit 9605749f) to
install files to a different location, and expects files to be in that
particular location later in the script. This means we can't set our own
destdir anymore, so just work with what upstream uses.
Signed-off-by: Alexandros Frantzis <email@example.com>
Reviewed-by: Emil Velikov <firstname.lastname@example.org>