build: Reduce libraries included with relocatable pressure-vessel
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build: Don't include dependencies of libwaffle in relocatable install
We don't want to bundle libX11 or libxcb.
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build: Link libsteam-runtime-tools into helpers statically
This avoids needing to include a shared library (for each architecture) with pressure-vessel.
i386 check-vulkan won't work unless libjson-glib-1.0-0:i386 is installed, but that seems a reasonable price to pay for not having to include two copies of GLib.