Commit 195c2ef8f9 added this to the Meson
build but neglected to add it to autotools.
v2: Also update dix-config.h.in
Fixes: 195c2ef8f ("glamor: Add a function to get the driver name via EGL_MESA_query_driver")
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com> [v1]
Reviewed-by: Eric Engestrom <eric@engestrom.ch> [v1]
Reviewed-by: Matt Turner <mattst88@gmail.com>