configure: set HAVE_foo_PLATFORM as applicable

Rather than having multiple places that define the macros, do it just
once in configure. Makes existing code a bit shorter and easier to
manage as we fix the VL targets with follow-up commits.

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
3 files changed