libdrm: remove autotools support

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
2 jobs for drop-autotools in 4 minutes and 19 seconds (queued for 13 seconds)
Status Name Job ID Coverage
  Build
passed latest-meson #742191

00:03:14

passed oldest-meson #742192

00:04:11