Enable KVM support in the Linux kernel

From #442: "KVM, unfortunately, doesn't compile with our current toolchain; I tried to patch it out, with no luck. It causes ``undefined reference to `__compiletime_assert___COUNTER__'`` errors at the final link, and unlike drm_edid, this doesn't seem to be patchable just by removing BUILD_BUG_ONs."

This issue is for tracking and solving that compile error.