tests/nouveau/threaded: adapt ioctl signature

POSIX says ioctl() has the signature (int, int, ...) but glibc has decided to
use (int, unsigned long int, ...) instead.

Use a #ifdef to adapt the replacement function as appropriate.

Signed-off-by: Ross Burton <ross.burton@intel.com>

[Taken from https://raw.githubusercontent.com/openembedded/openembedded-core/master/meta/recipes-graphics/drm/libdrm/musl-ioctl.patch

]
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>