Update of libbsd to close to FreeBSD 12 release planned

[Sebastian Huber]

Hello,

I started to work on this. Unfortunately, updating FreeBSD requires also 
some update of Newlib header files. I will remove the _KERNEL parts of 
the socket header files and use a kernel space only include. For an 
example see:

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;a=blob;f=newlib/libc/sys/rtems/include/sys/cpuset.h;h=a850575a14b50396832149943ed7fe6f7edba515;hb=HEAD#l227

Once this is done, we need a mandatory Newlib update for libbsd users.

-- 
Sebastian Huber, embedded brains GmbH

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