Fix merge botches. I hope there's no more left...

Merge the [pgoyette-compat] branch

Add missing RCSIDs.

Do not redefine linux syscalls arguments, just use compat ones
instead.
Include linux_socketcall.h to bring missing socket syscall
arguments/prototypes on arches that have socketcall(2).
Finally, cle

Do not redefine linux syscalls arguments, just use compat ones
instead.
Include linux_socketcall.h to bring missing socket syscall
arguments/prototypes on arches that have socketcall(2).
Finally, cleanup rump linux syscall wrapper, to remove linux syscall
argument/prototype local copy.

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Add syscall wrapper for mknodat(2) to deal with PAD argument difference
between rump and linux versions.