MFH: r502165 r502166 r502167 r502168

add graphics/drm-devel-kmod

Add graphics/drm-devel-kmod, development version of the lkpi based DRM
graphics drivers. This version is experimental, and for recent CURRENT
only.

This version currently corresponds to Linux 5.0 DRM drivers, and should give
better support for more recent Intel and AMD GPUs.

Please note that this port is copied from drm-current-kmod, rather than
resurrected from the old drm-devel-kmod port, that's because
drm-current-kmod was created by copying the old drm-devel-kmod when that
went to a more stable version.

Big thank you to everyone who has worked on this, and johalun in particuar,
who has done most of the heavy lifting.

Approved by: jmd (maintainer, implicit)
Sponsored by: B3 Init

drm-kmod ports: Update conflicts

Update conflicts for all drm-kmod ports to take into account the new
drm-devel-kmod port.

Sponsored by: B3 Init

Remove old drm-devel-kmod entry

Sponsored by: B3 Init

graphics/drm-current-kmod: Adjust FreeBSD compat

Update the FreeBSD OSVERSION compat of drm-current-kmod after the latest
update in r502043.

Suggested by: jbeich
Discussed with: johalun
Aproved by: jmd (maintainer, implicit)
Sponsored by: B3 Init

Approved by: ports-secteam (implicit, drm-drivers blanket)