configure.ac: split the wayland client/server confusion

configure.ac: split the wayland client/server confusion

At the moment wayland-clients, such as the Vulkan drivers were
over-linking against libwayland-server.so.

That went unnoticed, since both client and server code uses the
wl*interface symbols, which are present in both libwayland-client.so and
libwayland-server.so.

I've looked at correcting that, although that's orthogonal to this fix.

Note: wayland-egl does _not_ depend on wayland-client, although it does
need wayland-egl.h. There's no distinct package that provides it (I have
a WIP on the topic) so current solution will do for now.

v2: Rebase with the "...inline wayland_drm_buffer_get" patch removed.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>