leave a sane environment behind (even if empty) when exiting
some OS atexit() handlers call getenv()
upgraded libmagic to 5.14
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  upgraded libmagic to 5.14
updated NEWS
Merge branch 'PHP-5.5'

* PHP-5.5:
  updated NEWS
  upgraded libmagic to 5.14
  leave a sane environment behind (even if empty) when exiting some OS atexit() handlers call getenv()