Obsoletefiles.inc: Add architecture-specific 'runq.h' headers

These were removed in commit 2fefe2c88b31 ("runq: Deduce most
parameters, remove machine headers").

MFC with: 2fefe2c88b31 ("runq: Deduce most parameters, remove machine headers")
Sponsored by: The FreeBSD Foundation

(cherry picked from commit 8a69eb88fa00bb0ce85439d91cfdbd71426ffd0e)