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runtimes: Make Steam compatibility tools available

Simon McVittie requested to merge wip/usr-share-steam-compattools into master

As requested and later documented in https://github.com/ValveSoftware/steam-for-linux/issues/6310, Steam looks for compatibility tools in /usr{/local,}/share/steam/compatibilitytools.d. This is problematic for pressure-vessel, because pressure-vessel reserves /usr for the runtime and mounts the host's /usr in /run/host/usr, but Steam will pass an absolute path in /usr to be used to launch the compat tool. We can make this no longer a problem by creating symlinks to the host locations.

Partial fix for https://github.com/ValveSoftware/steam-runtime/issues/302 (we also need to mount $STEAM_EXTRA_COMPAT_TOOLS_PATHS, but that has to be done by changing pressure-vessel).

/cc @denittis

Currently untested. I'll try putting a test-build of Proton there.

pressure-vessel MR with the other half of this coming soon.

Edited by Simon McVittie

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