Random: wrap crypt_random_string in a function_exists call
Merge pull request #350 from terrafrost/crypt-random-string-function-exists

Random: wrap crypt_random_string in a function_exists call

* terrafrost/crypt-random-string-function-exists:
  Random: wrap crypt_random_string in a function_exists call
Merge branch 'master' into php5

* master:
  Random: wrap crypt_random_string in a function_exists call