NetBSD re-synchronization of the source tree

This brings our tree to NetBSD 7.0, as found on -current on the
10-10-2015.

This updates:
- LLVM to 3.6.1
- GCC to GCC 5.1
- Replace minix/commands/z

NetBSD re-synchronization of the source tree

This brings our tree to NetBSD 7.0, as found on -current on the
10-10-2015.

This updates:
- LLVM to 3.6.1
- GCC to GCC 5.1
- Replace minix/commands/zdump with usr.bin/zdump
- external/bsd/libelf has moved to /external/bsd/elftoolchain/
- Import ctwm
- Drop sprintf from libminc

Change-Id: I149836ac18e9326be9353958bab9b266efb056f0

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external/bsd/mdocml: Update

Change-Id: I17b54e52e8322676d83ed4386f586f8ef3029f72

imported code harmonisation

. common/include/arch/i386 is not actually an imported
sys/arch/i386/include but leftover Minix files;
remove and move to include/
. move include/ufs to sys/ufs,

imported code harmonisation

. common/include/arch/i386 is not actually an imported
sys/arch/i386/include but leftover Minix files;
remove and move to include/
. move include/ufs to sys/ufs, where it came from, now that
we have a sys/ hierarchy
. move mdocml/ to external/bsd/, now we have that
. single sys/arch/i386/stand/ import for boot stuff

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