Added sendmmsg and recvmmsg (#574) (#575) #583
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Added sendmmsg and recvmmsg methods for Android, Linux, FreeBSD, NetBSD, OpenBSD, Fuchsia and AIX. Note that Windows and MacOS do no support sendmmsg/recvmmsg.
Note that the timeout parameter in recvmmsg is buggy on Linux (see BUGS section in the recvmmsg manual page on Linux), but it should work on *BSD.
This also adds MMsgHdr and MMsgHdrMut structs (similar to MsgHdr and MsgHdrMut which are used for sendmsg/recvmsg). It is a bit nasty that I had to copy the methods of MsgHdr/MsgHdrMut to MMsgHdr/MMsgHdrMut but I don't see a better way.
I also added a simple unittest for sendmmsg and recvmmsg.