Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Use the in-tree sys/elf_common.h to build libelftc.

This fixes build failures on older releases that lack various
definitions such as EM_AARCH64 (which was unfixed before this).

Revert all of the recent compatibility changes that worked around this
problem.

This uses the same method of using the in-tree header as lib/libelf,
lib/libdwarf and usr.bin/readelf.

Reviewed by: emaste
Sponsored by: EMC / Isilon Storage Division
Differential Revision: https://reviews.freebsd.org/D6734

elftoolchain: backwards compatability for ELFOSABI_CLOUDABI definition

It is not provided by sys/elf_common.h on older releases or -current
before March 2015.

Reported by: Jenkins

Update to ELF Tool Chain r3475

Improvements include:

* Add support for reporting and handling a number of new constants in
various tools, including:
* CloudABI OSABI
* DT_TLSDESC_*
* i386, MIPS, SPARC and amd64 relocations

* C++ demangler bug fixes

* Man page updates

* Improved input validation in several tools

This update also reduces diffs against upstream as a number of fixes
included in upstream were previously cherry-picked into FreeBSD.

Sponsored by: The FreeBSD Foundation

Update ELF Tool Chain to upstream rev 3400

Some notable improvements include:

readelf:
- Add AArch64 relocation definitions.
- Report value of unknown relocation types.

elfcopy:
- Consider symbols with STB_GNU_UNIQUE binding as global symbols.
- Fixed support for VMA adjustment for loadable sections found
in relocatable objects.
- Handle nameless global symbols.
- Improve wildcard matching for !-prefixed symbols.
- Add PE/COFF support.

elfdump:
- Improve section type reporting.
- Add MIPS-specific section types.

This update also includes a significant number of bug fixes.

PR: 207091 [exp-run]
Sponsored by: The FreeBSD Foundation

Update to ELF Tool Chain r3250

Highlights (not already in the FreeBSD tree):
- addr2line: Fixed multiple memory leaks related to DIE allocation
- readelf: improve sh_link validation
- various man page improvements

Sponsored by: The FreeBSD Foundation

Add ELF Tool Chain's brandelf(1) to contrib

Noticed by pfg after r286070 (ar and elfdump)

Import ELF toolchain rev 3179

From http://svn.code.sf.net/p/elftoolchain/code

Import elftoolchain rev 3130

From svn.code.sf.net/p/elftoolchain/code/trunk

Initial import of elftoolchain r2974.

Obtained from: elftoolchain.org