Merge branch 'PHP-5.6.18' into PHP-5.6

* PHP-5.6.18:
  fix tests
  fix NEWS
  Update NEWS
  update NEWS
  Fixed bug #71488: Stack overflow when decompressing tar archives
  update NEWS
  add missing headers for SIZE_MAX
  backport the escapeshell* functions hardening branch
  add tests
  Fix bug #71459 - Integer overflow in iptcembed()
  prepare 5.6.18RC1
  Fixed bug #71323 - Output of stream_get_meta_data can be falsified by its input
  Fix bug #71391: NULL Pointer Dereference in phar_tar_setupmetadata()
  Fixed bug #71331 - Uninitialized pointer in phar_make_dirstream()
  Fix bug #71335: Type Confusion in WDDX Packet Deserialization
  Fix bug #71354 - remove UMR when size is 0

Conflicts:
	configure.in
	main/php_version.h