configure.ac: require libdrm 2.4.66 for drmGetDevice

since 737b6ed13e8f813987b5566004f0f45e9c55f1e8
src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c no longer compiles:
error: unknown type name ‘drmDevicePtr’
1 file changed