MFC r348993,349135:
Sync libarchive with vendor including security fixes

r348993:
- version bumped to 3.4.0
- check_symlinks_fsobj() without chdir() and fchdir()
- bsdtar.1 manpage fixes
- patches from OpenBSD to libarchive_fe/passphrase.c

r349135:
PR #1212: RAR5 reader - window_mask was not updated correctly
(OSS-Fuzz 15278)
OSS-Fuzz 15120: RAR reader - extend use after free bugfix

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

MFV r302264:

Sync libarchive with vendor, bugfixes for tests:
- fix tests on filesystems without birthtime support, e.g. UFS1 (1)
- vendor issue #729: avoid use of C99 for-scope declarations in
test_write_format_gnutar_filenames.c

MFC after: 1 week
PR: 204157 (1)
Approved by: re (hrs)

MFV r302003,r302037,r302038,r302056:

Update libarchive to 3.2.1 (bugfix and security fix release)

List of vendor fixes:
- fix exploitable heap overflow vulnerability in Rar decompression
(vendor issue 719, CVE-2016-4302, TALOS-2016-0154)
- fix exploitable stack based buffer overflow vulnebarility in mtree
parse_device functionality (vendor PR 715, CVE-2016-4301, TALOS-2016-0153)
- fix exploitable heap overflow vulnerability in 7-zip read_SubStreamsInfo
(vendor issue 718, CVE-2016-4300, TALOS-2016-152)
- fix integer overflow when computing location of volume descriptor
(vendor issue 717)
- fix buffer overflow when reading a crafred rar archive (vendor issue 521)
- fix possible buffer overflow when reading ISO9660 archives on machines
where sizeof(int) < sizeof(size_t) (vendor issue 711)
- tar and cpio should fail if an input file named on the command line is
missing (vendor issue 708)
- fix incorrect writing of gnutar filenames that are exactly 512 bytes
long (vendor issue 682)
- allow tests to be run from paths that are equal or longer than 128
characters (vendor issue 657)
- add memory allocation errors in archive_entry_xattr.c (vendor PR 603)
- remove dead code in archive_entry_xattr_add_entry() (vendor PR 716)
- fix broken decryption of ZIP files (vendor issue 553)
- manpage style, typo and description fixes

Post-3.2.1 vendor fixes:
- fix typo in cpio version reporting (Vendor PR 725, 726)
- fix argument range of ctype functions in libarchive_fe/passphrase.c
- fix ctype use and avoid empty loop bodies in WARC reader

MFC after: 1 week
Security: CVE-2016-4300, CVE-2016-4301, CVE-2016-4302
Approved by: re (kib)

MFV r299425:

Update libarchive to 3.2.0

New features:
- new bsdcat command-line utility
- LZ4 compression (in src only via external utility from ports)
- Warc format support
- 'Raw' format writer
- Zip: Support archives >4GB, entries >4GB
- Zip: Support encrypting and decrypting entries
- Zip: Support experimental streaming extension
- Identify encrypted entries in several formats
- New --clear-nochange-flags option to bsdtar tries to remove noschg and
similar flags before deleting files
- New --ignore-zeros option to bsdtar to handle concatenated tar archives
- Use multi-threaded LZMA decompression if liblzma supports it
- Expose version info for libraries used by libarchive

Patched files (fixed compiler warnings):

contrib/libarchive/cat/bsdcat.c (vendor PR #702)
contrib/libarchive/cat/bsdcat.h (vendor PR #702)
contrib/libarchive/libarchive/archive_read_support_format_mtree.c (PR #701)
contrib/libarchive/libarchive_fe/err.c (vendor PR #703)

MFC after: 1 month
Relnotes: yes

Update vendor/libarchive/dist to git commit 61c56e5 (post 3.2.0)