meson: drop deprecated EGL platform build options

These two options were deprecated and announced to be removed in 20.3,
so let's drop them now.

Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Acked-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Cc: 20.3 <mesa-stable>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5844>
(cherry picked from commit f8dc22bf61c1e6008f6954ffd25c1ee322f500c6)
3 files changed