Adding code to detect whether this is a 32-bit or 64-bit PHP build

src/Rhumsaa/Uuid/Uuid.php

@@ -97,6 +97,13 @@ final class Uuid
      */
     protected function __construct($msb, $lsb)
     {
+        if (PHP_INT_SIZE == 4) {
+            throw new \OverflowException(
+                'Attempting to create a UUID on a 32-bit build of PHP. This '
+                . 'library requires a 64-bit build of PHP.'
+            );
+        }
+
         $this->msb = $msb;
         $this->lsb = $lsb;
     }