This was a nasty race condition where each thread could be accessing the
DRM cache at any given moment. Move it over to a per thread object that
is only allocated once it gets used.
Also removes an `atexit` registration that contributes to crashing on
exit.
Removes a global static initializer for the vector and its atexit
handler.
This handler array can be consteval similar to the x86 tables so it can
be generated entirely at compile time.
Which requires moving LinuxEmulation to its own independent folder as
well. Since both IRLoader and FEXLoader rely on it.
No functional change, just moves the the code around.
Ryan Houdek