Pull up following revision(s) (requested by pgoyette in ticket #588):
sys/compat/common/compat_30_mod.c: revision 1.3
For the built-in COMPAT_30 module code, make sure to initialize the
uipc_syscalls_30 stuff, notably to include compat_30_socket().
PR kern/54804
XXX Pullup-9 XXX

(martin)