Update ELF Tool Chain to upstream r3769

This contains many small bugfixes and documentation improvements.

Sponsored by: The FreeBSD Foundation

Update to ELF Tool Chain r3668

Highlights:
- Make sure that only TLS sections are sorted into TLS segment.
- Fixed multiple errors in "Section to Segment mapping".
- Man page updates
- ar improvemen

Update to ELF Tool Chain r3668

Highlights:
- Make sure that only TLS sections are sorted into TLS segment.
- Fixed multiple errors in "Section to Segment mapping".
- Man page updates
- ar improvements
- elfcopy: avoid filter_reloc uninitialized variable for rela
- elfcopy: avoid stripping relocations from static binaries
- readelf: avoid printing directory in front of absolute path
- readelf: add NT_FREEBSD_FEATURE_CTL FreeBSD note type
- test improvements

NOTES:

Some of these changes originated in FreeBSD and simply reduce diffs
between contrib and vendor.

ELF Tool Chain ar is not (currently) used in FreeBSD, and there are
improvements in both FreeBSD and ELF Tool Chain ar that are not in
the other.

Sponsored by: The FreeBSD Foundation

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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_*

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

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Update to ELF Tool Chain r3272

Highlights (not already in the FreeBSD tree):
- addr2line: Speed up and support searching inlined functions
- addr2line: Support -i, -a, -p options
- readelf: Add s

Update to ELF Tool Chain r3272

Highlights (not already in the FreeBSD tree):
- addr2line: Speed up and support searching inlined functions
- addr2line: Support -i, -a, -p options
- readelf: Add some ARM relocation types
- readelf, libelf: Avoid reading beyond end of buffer/file

Relnotes: Yes
Sponsored by: The FreeBSD Foundation

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Update elftoolchain to upstream revision 3179

Some notable changes:
- libdwarf: Fixed DWARF4 line section
- elfcopy: Implement --localize-hidden
- nm: handle object name referenced by DW_AT_specific

Update elftoolchain to upstream revision 3179

Some notable changes:
- libdwarf: Fixed DWARF4 line section
- elfcopy: Implement --localize-hidden
- nm: handle object name referenced by DW_AT_specification
- elfcopy: Add --strip-dwo and --extract-dwo options for split DWARF
- readelf: add remaining arm64 dynamic relocation names
- nm: Avoid integer overflow in value comparison

Relnotes: Yes
Sponsored by: The FreeBSD Foundation

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Update elftoolchain to upstream rev 3130

This brings a number of fixes to elfcopy/strip and DWARF4 improvements.

Sponsored by: The FreeBSD Foundation

Copy libelf, libdwarf and common files from vendor/ to contrib/.