Merge branch 'PHP-7.1' of git.php.net:/php-src into PHP-7.1

* 'PHP-7.1' of git.php.net:/php-src:
  Fixed bug #73730 (textdomain(null) throws in strict mode)
  Fix bug75178.phpt on Windows
  Fixed bug #75178 (bcpowmod() misbehaves for non-integer base or modulus)
  Add BC define for users of the typoed zend_symbtable_add_new
  Fix typo in zend_symtable_add_new() API name
  Fixed bug #54598 (bcpowmod() may return 1 if modulus is 1)
  Fixed bug #44995 (bcpowmod() fails if scale != 0)
  Add missing null termination
  Fixed bug #70470
  Add test for bug #75155
  Revert "Fixed #74977 - Appending AppendIterator leads to segfault"