src/socket_wrapper.c: handle raw SYS_close, SYS_recvmmsg and SYS_sendmmsg syscall...

src/socket_wrapper.c: handle raw SYS_close, SYS_recvmmsg and SYS_sendmmsg syscall() invocations

This fixes a problem hit by 'nsupdate -g' and bind9 (dnsutils). If bind is built
against libuv <= 1.44.2 it will not use sendmmsg/recvmmsg functions from libc
but use the corresponding syscalls directly. Newer version of libuv removed
the syscall wrappers and use sendmmsg/recvmmsg from libc.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>