MFH r336801,r336854:

MFH r336801,r336854:

MFH r336801 (cem):
Cherry-pick upstream 2c8c83b9

Relevant vendor changes:
  Fix issue #948: out-of-bounds read in lha_read_data_none()

MFH r336854:
Sync libarchive with vendor.

Important vendor changes:
  PR #993: Chdir to -C directory for metalog processing
  OSS-Fuzz #4969: Check size of the extended time field in zip archives
  PR #973: Record informational compression level in gzip header

amdbugs:	877
Security:	CVE-2017-14503

git-svn-id: svn://svn.freebsd.org/base/stable/10@337352 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f