Description:
------------
When PHP is compiled on a recent kernel, it assumes that getrandom is available.
When such a PHP build is running on an older kernel, this code throws an exception.


cf. pull request 2385

Test script:
---------------
<?php 
$a = random_int(0,10);
?>

Expected result:
----------------
Fallback to /dev/urandom and return a number
Or
Exit with a more explicit error message (checking ENOSYS)


Actual result:
--------------
PHP Fatal error:  Uncaught Exception: Could not gather sufficient random data in -:2
Stack trace:
#0 -(2): random_int(0, 200)
#1 {main}
  thrown in - on line 2