Add a new group named 'video' with the id of 44. And make drm create

devices in /dev/dri/ with this new group.

This will allow ports and users to more easily access to these devices
for OpenGL and OpenCL support.

Reviewed by:	dumbbell@
Approved by:	dumbbell@
Differential Revision:	https://reviews.freebsd.org/D1260

UPDATING

@@ -31,6 +31,14 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 11.x IS SLOW:
 	disable the most expensive debugging functionality run
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20150809:
+	The default group assigned to /dev/dri entries has been changed
+	from 'wheel' to 'video' with the id of '44'. If you want to have
+	access to the dri devices please add yourself to the video group
+	with:
+
+	# pw groupmod video -m $USER
+
 20150806:
 	The menu.rc and loader.rc files will now be replaced during 
 	upgrades. Please migrate local changes to menu.rc.local and

etc/group

@@ -17,6 +17,7 @@ sshd:*:22:
 smmsp:*:25:
 mailnull:*:26:
 guest:*:31:
+video:*:44:
 bind:*:53:
 unbound:*:59:
 proxy:*:62:

sys/dev/drm/drmP.h

@@ -175,7 +175,7 @@ SYSCTL_DECL(_hw_drm);
 
 #define DRM_DEV_MODE	(S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP)
 #define DRM_DEV_UID	0
-#define DRM_DEV_GID	0
+#define DRM_DEV_GID	44	/* "video" group */
 
 #define wait_queue_head_t	atomic_t
 #define DRM_WAKEUP(w)		wakeup((void *)w)

sys/dev/drm2/drmP.h

@@ -1593,7 +1593,7 @@ SYSCTL_DECL(_hw_drm);
 
 #define DRM_DEV_MODE	(S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP)
 #define DRM_DEV_UID	0
-#define DRM_DEV_GID	0
+#define DRM_DEV_GID	44	/* "video" group */
 
 #define DRM_WAKEUP(w)		wakeup((void *)w)
 #define DRM_WAKEUP_INT(w)	wakeup(w)