meson: drop duplicate addition of surfaceless & drm to the list of platforms
This is already done on lines 475-480, resulting in them appearing twice in the summary. Fixes: 47946855 ("meson: allow egl_native_platform to be specified") Signed-off-by:Eric Engestrom <eric@engestrom.ch> Reviewed-by:
Adam Jackson <ajax@redhat.com> Part-of: <mesa/mesa!13278> (cherry picked from commit 9ad375bd)