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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Importing NetBSD "Kyua" test framework

To do so, a few dependencies have been imported:

* external/bsd/lutok
* external/mit/lua
* external/public-domain/sqlite
* external/public-domain/xz

The

Importing NetBSD "Kyua" test framework

To do so, a few dependencies have been imported:

* external/bsd/lutok
* external/mit/lua
* external/public-domain/sqlite
* external/public-domain/xz

The Kyua framework is the new generation of ATF (Automated Test
Framework), it is composed of:

* external/bsd/atf
* external/bsd/kyua-atf-compat
* external/bsd/kyua-cli
* external/bsd/kyua-tester
* tests

Kyua/ATF being written in C++, it depends on libstdc++ which is
provided by GCC. As this is not part of the sources, Kyua is only
compiled when the native GCC utils are installed.

To install Kyua do the following:

* In a cross-build enviromnent, add the following to the build.sh
commandline: -V MKBINUTILS=yes -V MKGCCCMDS=yes

WARNING:
At this point the import is still experimental, and not supported
on native builds (a.k.a make build).

Change-Id: I26aee23c5bbd2d64adcb7c1beb98fe0d479d7ada

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