Spawns a child using fork and exec as opposed to fork alone. Workaround
for the macos file manager complaining about not supporting fork without
exec.
Control flow for *nix is now roughly the same as for Windows.
The startup check apparently confuses other programs when yuzu launches
2 processes and then quickly closes one of them. Though this isn't
really our issues it's also not a big deal for me to add an option to
work around that issue.
