Change libdrm to not check device major ID, it is not always zero

[rezny]

Summary

Problems some users have had after updating Mesa to v13 have been traced back to libdrm which is responsible for hardware detection. libdrm was patched to use libdevq and assumed the device major ID is 0, but that is apparently not always the case. Credit goes to hps for determining the major ID check as the culprit.

Test Plan

Poudriere 10.3/11.0 amd64/i386 OK, run verified on 11-STABLE amd64, awaiting final confirmation on drm-next kernel

[• hselasky]

Patch works like expected.

[swills]

Approved