Update of mDNSResolver of libbsd to Apple version 878.30.4

[Sebastian Huber]

Hello,

I updated the mDNSResolver contained in the libbsd to the Apple version 
878.30.4. All upstream changes applied without conflicts.

https://devel.rtems.org/ticket/3522

I moved the mDNS_StartResolveService() and mDNS_StopResolveService() to 
an RTEMS-specific file (rtemsbsd/mdns/mDNSResolveService.c) using the 
v576.30.4 implementation. Apple removed these functions without 
explanation. We use them in the foobarclient test program.

-- 
Sebastian Huber, embedded brains GmbH

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