Merge pull request #12232 from deeky666/php-5.5.31

php: 5.5.30 -> 5.5.31

pkgs/development/interpreters/php/default.nix

···
   };
 
   php55 = generic {
-    version = "5.5.30";
-    sha256 = "0a9v7jq8mr15dcim23rzcfgpijc5k1rkc4qv9as1rpgc7iqjlcz7";
+    version = "5.5.31";
+    sha256 = "0xx23gb70jsgbd772hy8f79wh2rja617s17gnx4vgklxk8mkhjpv";
   };
 
   php56 = generic {