Add support for FEX-Emu thunking
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Add support for FEX-Emu graphics thunking
When we are using an interpreter like FEX, we have a FEX's rootfs, that is usually x86-64, and the real host system root, that is usually AArch64.
When setting up the runtime we can also include the real host graphics DRIs/layers to support thunking. Then, based on what the loader needs, the correct architecture libraries will be loaded at runtime.
Part of #92 (closed)
TODO: OpenGL and VA-API support. I plan on adding those next in this MR or as a followup. Done
Edited by Ludovico de Nittis