Merge from projects/elftoolchain: Upgrade libelf and libdwarf to newer

versions from elftoolchain upstream (r2974).  Convert ctfconvert to
use the APIs from the new libdwarf and make ctfconvert work with Clang
3.4.

__FreeBSD_version is bumped to 1100006.

A list of notable changes:

[libelf]

* The old libelf source code in lib/libelf has been removed.
  Instead, the new libelf is built from contrib/elftoolchain/libelf.
* Manual pages are largely improved.
* Internal implementation was refactored and improved for better
  correctness and portability.
* Fixed a few memory leaks.
* Extended with extension APIs `elf_open()` and `elf_openmemory()`.
  These APIs are similar to `elf_begin()` and `elf_memory()`
  respectively, except that they return an ELF descriptor of kind
  `ELF_K_NONE` instead of an error if the object being opened could
  not be parsed.
* Implement support for translating sections of type ELF_T_VDEF and
  ELF_T_VNEED.
* Improve `elf_update()` to check that the executable header, the
  program header table, section contents and the section header table
  do not overlap, and to ensure that gaps between extents are
  filled with the fill character specified by `elf_fill()`.
* Allow `Elf_Data` descriptors to have types and alignments differing
  from their containing section.
* Remove functionality controlled by `LIBELF_TEST_HOOKS`.
* Support processing of BSD-flavor archives.
* Add knowledge of section types `SHT_GNU_ATTRIBUTES` and
  `SHT_GNU_LIBLIST`.
* Use elftoolchain style symbol versioning.
* Shared library version is bumped.

[libdwarf]

* The old libdwarf source code in lib/libdwarf has been removed.
  Instead, the new libdwarf is built from contrib/elftoolchain/libdwarf.
* Support full DWARF3 and partial DWARF4 parsing.
* Support DWARF2 generation.
* Support for DWARF line number, call frame, location expression,
  macro info and address ranges, among other things.
* The APIs for the new libdwarf are mostly compatible with the widely
  used LGPL libdwarf. Some of the incompatible APIs from the old
  libdwarf are kept as its own extensions. All the APIs are documented.
* Use elftoolchain style symbol versioning.
* Shared library version is bumped.

[ctfconvert]

* Switch to the APIs from the new libdwarf.
* Improve die_mem_offset() so that DW_AT_data_member_location attributes
  generated by Clang 3.4 can be handled properly.
* Make use of DW_AT_byte_size attribute of the member DIE to calculate
  the bits occupied by the member's type, without actually resolving
  the type. This way ctfconvert can deal with the case that Clang 3.4
  sometimes emits DIE for struct/union member before emitting the DIE
  for the type of that member.

Obtained from:	elftoolchain
No objection:	-toolchain mailing list

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