Decode recvmmsg syscall

* net.c (do_msghr): New function to print struct msghdr.
(printmsghdr): Use it.
(printmmsghdr, sys_recvmmsg): New.
* linux/syscall.h: Declare sys_recvmmsg.
(SYS_sub_recvmmsg): Define.
(SYS_socket_nsubcalls): Bump.
* linux/sparc/syscall.h: Likewise.
* linux/arm/syscallent.h: Add sys_recvmmsg.
* linux/bfin/syscallent.h: Likewise.
* linux/i386/syscallent.h: Likewise.
* linux/m68k/syscallent.h: Likewise.
* linux/powerpc/syscallent.h: Likewise.
* linux/s390/syscallent.h: Likewise.
* linux/s390x/syscallent.h: Likewise.
* linux/sh/syscallent.h: Likewise.
* linux/sh64/syscallent.h: Likewise.
* linux/sparc/syscallent.h: Likewise.
* linux/ia64/syscallent.h: Adjust.
14 files changed