Allow SCP test to run on 5.2 by not depending on GMP, but also allowing bcmath.
Merge pull request #560 from bantu/php-5.2-functional-gmp

Make SCP test on 5.2 run by allowing bcmath.

* bantu/php-5.2-functional-gmp:
  Allow SCP test to run on 5.2 by not depending on GMP, but also allowing bcmath.