Update Random_Compat from 1.1.6 to 1.2.1.

Changes: https://github.com/paragonie/random_compat/compare/1.1.6...v1.2.1

See #35665.

git-svn-id: https://develop.svn.wordpress.org/trunk@36886 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/random_compat/random_bytes_dev_urandom.php

@@ -62,6 +62,7 @@ function random_bytes($bytes)
                 $fp = false;
             }
         }
+
         if (!empty($fp)) {
             /**
              * stream_set_read_buffer() does not exist in HHVM
@@ -79,6 +80,7 @@ function random_bytes($bytes)
             }
         }
     }
+
     try {
         $bytes = RandomCompat_intval($bytes);
     } catch (TypeError $ex) {
@@ -86,11 +88,13 @@ function random_bytes($bytes)
             'random_bytes(): $bytes must be an integer'
         );
     }
+
     if ($bytes < 1) {
         throw new Error(
             'Length must be greater than 0'
         );
     }
+
     /**
      * This if() block only runs if we managed to open a file handle
      * 
@@ -101,6 +105,7 @@ function random_bytes($bytes)
     if (!empty($fp)) {
         $remaining = $bytes;
         $buf = '';
+
         /**
          * We use fread() in a loop to protect against partial reads
          */
@@ -133,6 +138,7 @@ function random_bytes($bytes)
             }
         }
     }
+
     /**
      * If we reach here, PHP has failed us.
      */