scons: Require libdrm >= 2.4.66 for DRM.

scons: Require libdrm >= 2.4.66 for DRM.

configure.ac already requires 2.4.66.

Fix SCons build. drmDevicePtr is not available until libdrm 2.4.65.

  Compiling src/loader/loader.c ...
src/loader/loader.c:111:40: error: unknown type name ‘drmDevicePtr’
 static char *drm_construct_id_path_tag(drmDevicePtr device)
                                        ^

Fixes: 4a183f4d06f8 ("scons: loader: use libdrm when available")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98421
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Vedran Miletić <vedran@miletic.net>