multimedia/mpv: unbreak without X11/Wayland after 628ae700cef8

ld: error: undefined symbol: mp_present_initialize

referenced by drm_common.c

libmpv.so.2.2.0.p/video_out_drm_common.c.o:(vo_drm_init)

ld: error: undefined symbol: present_sync_update_values

referenced by drm_common.c

libmpv.so.2.2.0.p/video_out_drm_common.c.o:(drm_pflip_cb)

ld: error: undefined symbol: present_sync_swap

referenced by drm_common.c

libmpv.so.2.2.0.p/video_out_drm_common.c.o:(drm_pflip_cb)

ld: error: undefined symbol: present_sync_get_info

referenced by vo_drm.c

libmpv.so.2.2.0.p/video_out_vo_drm.c.o:(get_vsync)

Reported by: olgeni