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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new libunwind, updated to netbsd b1f513eedd

existing libunwind used '0' in lsda_encoding as 'not present,'
whereas that is a valid encoding and does occur and would be
ignored. a missing encoding is

new libunwind, updated to netbsd b1f513eedd

existing libunwind used '0' in lsda_encoding as 'not present,'
whereas that is a valid encoding and does occur and would be
ignored. a missing encoding is actually 0xff.

The commit that addresses this is:

commit 8d4b51028d1a12b58d616f4b605254a877caafcf
Author: joerg <joerg>
Date: Tue Mar 11 23:52:17 2014 +0000

0 is a valid LSDA encoding and can be seen in statically linked
programs. Initialize lsdaEncoding to DW_EH_PE_omit and check for that
value to decide whether a value should be decoded.

more bugfixes are necessary. this update is up to:

commit b1f513eedd332426d88acbb118b6e9070966dcb9
Author: joerg <joerg>
Date: Wed May 14 22:13:36 2014 +0000

Lazy VFP processing works a lot better if the functions contain a return
instruction.

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Importing sys/libunwind for clang

Change-Id: Ib073b27e3b883837e682414ef7df56c84ca10816