radv: port to new libdrm API.

This bumps the libdrm requirement for amdgpu to the 2.4.82.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/configure.ac b/configure.ac
index 38cd127..2689fc5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -74,7 +74,7 @@
 # in the first entry.
 LIBDRM_REQUIRED=2.4.75
 LIBDRM_RADEON_REQUIRED=2.4.71
-LIBDRM_AMDGPU_REQUIRED=2.4.81
+LIBDRM_AMDGPU_REQUIRED=2.4.82
 LIBDRM_INTEL_REQUIRED=2.4.75
 LIBDRM_NVVIEUX_REQUIRED=2.4.66
 LIBDRM_NOUVEAU_REQUIRED=2.4.66