Switch to shared libraries.

When mesa is built out-of-tree it depends on the system
libwayland-client.so, so apps built in tree that use the
Vulkan Wayland swapchain should use the same client library
implementation.

Change-Id: I08187c45dc0be3ef400c8a69a7b757058b452784
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/wayland/+/571756
Reviewed-by: David Reveman <reveman@google.com>