AMDVLK Driver Updated With Environment Variable To Enable Experimental Extensions

AMD normally just does one code drop per week to their open-source "AMDVLK" Linux Vulkan driver code-base but now today marks the second time this week being greeted by new code. This latest release, v-2019.Q1.5, should provide for some fun weekend testing by Linux gamers preferring this driver over Mesa's RADV...