Move os-dependent stuff out of radeon_irq.c
drwxr-xr-x - bsd-core
drwxr-xr-x - bsd
drwxr-xr-x - libdrm
drwxr-xr-x - linux-core
drwxr-xr-x - linux
drwxr-xr-x - shared-core
drwxr-xr-x - shared
drwxr-xr-x - tests