radv/winsys: use drmGetDevice2 API

Analogous to previous commit

v2: Add explicit require_libdrm check.

Cc: Dave Airlie <airlied@redhat.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> (v1)
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> (v1)
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com> (v1)
Tested-by: Mike Lothian <mike@fireburn.co.uk>
diff --git a/configure.ac b/configure.ac
index 6b65ff8..a006976 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1792,6 +1792,7 @@
 
             ;;
         xradeon)
+            require_libdrm "radv"
             PKG_CHECK_MODULES([AMDGPU], [libdrm >= $LIBDRM_AMDGPU_REQUIRED libdrm_amdgpu >= $LIBDRM_AMDGPU_REQUIRED])
             radeon_llvm_check $LLVM_REQUIRED_RADV "radv"
             HAVE_RADEON_VULKAN=yes