* PHP-5.5:
  Fix buffer growth in sockets/conversion.c

memset() the *end* of the new buffer, not the beginning
Copy the pointer to the buffer, not its initial contents

Fixes bug 69619

* PHP-5.5:
  Use better constant since MAXHOSTNAMELEN may mean shorter name
  use right sizeof for memset

* PHP-5.4:
  Use better constant since MAXHOSTNAMELEN may mean shorter name
  use right sizeof for memset

* PHP-5.5:
  Add mitigation for CVE-2015-0235 (bug #68925)
  Add mitigation for CVE-2015-0235 (bug #68925)