[Udpcast] Darwin build fixes patch

[Devin Bayer]

Hello.  Thanks for developing udpcast.  It almost compiles on my  
mac.  But I have to make a few small changes.

1.) the linker doesn't support the -Wl,-warn-common option
2.) what is malloc.h?  It isn't needed.
3.) struct ifreq is variable size, so we must use _SIZEOF_ADDR_IFREQ 
(), not pointer arithemetic
4.) some endian issues

Thanks,
Devin Bayer

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