Merge branch 'PHP-7.0'

* PHP-7.0:
  iFixed bug #72446 - Integer Overflow in gdImagePaletteToTrueColor() resulting in heap overflow
  update NEWS
  fix tests
  fix build
  Fix bug #72455:  Heap Overflow due to integer overflows
  Fix bug #72434: ZipArchive class Use After Free Vulnerability in PHP's GC algorithm and unserialize
  Fixed ##72433: Use After Free Vulnerability in PHP's GC algorithm and unserialize
  Fix bug #72407: NULL Pointer Dereference at _gdScaleVert
  Fix bug #72402: _php_mb_regex_ereg_replace_exec - double free
  Fix bug #72298	pass2_no_dither out-of-bounds access
  Fixed #72339 Integer Overflow in _gd2GetHeader() resulting in heap overflow
  Fix bug #72262 - do not overflow int
  Fix bug #72400 and #72403 - prevent signed int overflows for string lengths
  Fix bug #72275: don't allow smart_str to overflow int
  Fix bug #72340: Double Free Courruption in wddx_deserialize
  Fix bug #72321 - use efree() for emalloc allocation
  5.6.23RC1
  fix NEWS
  set versions

diff --cc ext/mbstring/php_mbregex.c
Simple merge

diff --cc ext/phar/phar_object.c
Simple merge

diff --cc ext/wddx/wddx.c
Simple merge

diff --cc ext/zip/php_zip.c
Simple merge