Merge branch 'PHP-5.6'

Merge branch 'PHP-5.6'

* PHP-5.6:
  Add NEWS
  Patch commit d9f85373e32 by moving the float_to_double function to a header file.
  Fix for bugs #68114 (Build fails on OS X due to undefined symbols) and #68657 (Reading 4 byte floats with Mysqli and libmysqlclient has rounding errors).
  Patch commit d9f85373e32 by moving the float_to_double function to a header file.
  Fix for bugs #68114 (Build fails on OS X due to undefined symbols) and #68657 (Reading 4 byte floats with Mysqli and libmysqlclient has rounding errors).

Conflicts:
	ext/mysqli/mysqli_api.c
	ext/mysqlnd/mysql_float_to_double.h