Merge branch 'master' of git.php.net:php-src

* 'master' of git.php.net:php-src: (70 commits)
  convert_to_string also does the check
  A better fix(do the convertion in compile time)
  update UPGRADING.INTERNALS
  better description for the toolset config option
  use proper declarations for zend_stat_t
  move these functions to the appropriate place
  Fixed segfault in  bug62500.phpt
  Update NEWS
  Fixed bug #68370 ("unset($this)" can make the program crash)
  move more common ldflags into function
  rename intel toolset to icc - shorter
  fix gd compilation with icc toolset
  either ms or intel linker is used, /libpath is supported
  further catch up with phpize and improved clang arch setup
  add /fallback for clang-cl
  parametrize WINVER and update its value
  further refactoring of toolset+phpize stuff
  catch up the toolset changes with phpize
  fix linking for clang, using linker directly
  adjust pid_t declaration so it doesn't conflict with apache one
  ...
Fix skipif test here