Add xf86-video-radeonhd-devel 188.8.131.5280906, supports new
devices and features than xf86-video-radeonhd, but experimental.
Add CONFLICTS xf86-video-radeonhd and xf86-video-radeonhd-devel.
In this time, DRI is not usable. Because 3D acceleration will
disable 2D acceleration, and it supports R5xx series only:-(.
EXA might be usable rather than XAA. Because some XAA functions
aren't implemented. But 2D acceleration is supported only R5xx.
RV670: Radeon HD 3690, FireStream 9170
M86: Mobility Radeon HD 3650, HD 3670, Mobility FireGL V5700
M88: Mobility Radeon HD 3850, HD 3850 X2, HD 3870, HD3870 X2
RS740: RS740, RS740M
RS780: Radeon HD 3100/3200/3300 Series
RV770: Radeon HD 4800 Series; Everest, K2, Denali ATI FirePro
Repocopied by: portmgr (marcus)
Tested by: many people on freebsd-current@ and freebsd-stable@