third_party/wayland: Add wayland_client and wayland_protocol targets to wayland.gyp
third_party/wayland: Add wayland_client and wayland_protocol targets to wayland.gyp

This matches the targets present in BUILD.gn.

BUG=578890

Review URL: https://codereview.chromium.org/1584653011

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#370307}

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