package/libdrm: fix nouveau tests compile for musl

package/libdrm: fix nouveau tests compile for musl

Add openembedded provided patch [2] to fix musl toolchain compile failures
because of different ioctl() signatures, (int, int, ...) vs. (int, unsigned
long, ...).

Fixes:

  ../tests/nouveau/threaded.c:39:5: error: conflicting types for 'ioctl'
  int ioctl(int fd, unsigned long request, ...)

[1] http://autobuild.buildroot.net/results/047f149a928ac2a17e25211a0a8a264ebae369ac
[2] https://github.com/openembedded/openembedded-core/blob/master/meta/recipes-graphics/drm/libdrm/musl-ioctl.patch

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>