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pv-wrap: Use correct bwrap exports while using an interpreter

Ludovico de Nittis requested to merge wip/denittis/issue98 into main

The Flatpak code that deals with X11, D-Bus etc... searches in both the real root filesystem and also the FEX-Emu rootfs.

But because bwrap's mount(2) doesn't do an automatic remap of the paths, a workaround was manually implemented. Every time a file/directory was available in the interpreter root, we adjusted the bind to use the FEX-Emu's rootfs.

However this introduced an issue where the /run/host/... bind mounts would point to the FEX-Emu rootfs overlay instead of the the real host, as we would normally expect. To fix that we need to always keep the binds as-is, unless the real host root doesn't have the file we are trying to bind. And only in that case we should switch to the interpreter rootfs.

Helps #98 (closed)

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