package/libdrm: add host variant
host-libdrm is needed by host-mesa3d (introduced by this patch series),
which is needed by (target) mesa3d, when enabling the Gallium Iris
driver since version 24.1.0.
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>