WIP: Silence misleading warnings about gameoverlayrenderer.so

Ludovico de Nittis requested to merge wip/gameoverlayrenderer into master

When we need to run the main executable for a game, Steam usually appends to the LD_PRELOAD the 32-bit and 64-bit version of gameoverlayrenderer.so

However this leads to multiple warnings in the pressure-vessel log because ld.so will complain that it was not able to preload the 32-bit (or 64-bit) version of the library that was requested.

To avoid that we can special case the game overlay library and replace it with a path that contains ${PLATFORM}. In this way at runtime it will always point to the library of the right ABI.

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