math.3/tgmath.3: Bump dates and fix minor mdoc issues.
ifq: Remove the unused parameter 'mpolled' from ifq dequeue interface

The ifq_poll() -> ifq_dequeue() model is not MPSAFE, and mpolled has
not been used, i.e. set to NULL, for years; time to let it go.
cam(3): Fix a wrong check and bump WARNS to 2.
altq: Remove the unused parameter 'mpolled' from dequeue method
ifq/classic: Add pkthdr assertion
ifq: Add ifsq_poll_pktlen, which calculate the polled mbuf's length

Calculating the polled mbuf's length w/o ALTQ lock is not MPSAFE.
ifsubque: Cut ties with ifqueue
Merge branch 'master' into gsocdrm_jfree
rpc.statd(8): Fix warnings and bump WARNS to 6.
Merge branch 'master' into gsocdrm_github