Fix build of x11-drivers/xf86-video-ati-legacy

[zeising]

Summary

Attached patch fixes the build of xf86-video-ati-legacy after the xorg-server 1.20.7 update.
I have not verified if it works runtime

Test Plan

@danfe has promised to help test, hopefully other users of ati-legacy will as well.
Putting the patch here for exposure.

[zeising]

Update patch to remove BROKEN=

[pfg]

It did compile but no joy sadly :(.
I left the complete log here:
https://people.freebsd.org/~pfg/docs/Xorg.0.log

...

[ 181.833] (II) Initializing extension DRI2
[ 181.834] (EE) RADEON(0): Failed to make prime FD for handle: 22
[ 181.834] (EE) RADEON(0): Failed to create textured screen.(II) RADEON(0): Setting screen physical size to 338 x 270

[danfe]

@pfg wrote:

It did compile but no joy sadly :(

I'm seeing the same on amd64 laptop with drm-legacy-kmod-g20200306. I'll try to test on i386 but do not have an ETA for that. :-(

[grahamperrin]

Does the recent removal of graphics/drm-legacy-kmod make this review redundant?

https://svnweb.freebsd.org/ports?view=revision&revision=559748