Bump to libdrm 2.4.83
2017-09-22 (over 4 years late)
Please bump illumos DRM kernel module per libdrm 2.4.83
Mainly, adds support for Intel GEN 10 and newer PCI IDs. (Cannonlake/CoffeeLake).
Additionally, provides better dev support for AMDgpu integrations. (AMDgpu 1.4.0/Radeon 7.10)