test: Skip if wayland/weston-info aren't installed

José Expósito requested to merge jexposit/xserver:issue-1536 into master

When neither wayland-info nor weston-info are installed, the xwayland-piglit.sh script will wait indefinitely for the compositor to start.

Check that one of the tools is available and skip the test otherwise.

Closes: #1536 (closed)

cc @daenzer @ofourdan

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