Revert "Add SO_REUSEPORT + SO_BROADCAST support via socket stream context option"

This reverts commit a51bf0cadf7862d10b2cc19cae2c991d24d670b1.
NEWS and UPGRADING for intdiv()
Merge branch 'PHP-5.6'

* PHP-5.6:
  Revert "Add SO_REUSEPORT + SO_BROADCAST support via socket stream context option"

  Didn't actually merged the revert as we wan't to keep this in master, but merged it with -s ours.