[Patch] Scalar-List-Util tests should require XS part

Hello, all!

Currently some of List::Util and Scalar::Util tests are skipped if XS
part was not built.
This patch will make building perl without XS part of  Scalar-List-Util harder.

In general, I think there is little use for Scalar-List-Util without
XS - many CPAN modules require weaken.

-- 
Alexandr Ciornii, http://chorny.net

• [Patch] Scalar-List-Util tests should require XS part by Alexandr Ciornii
• Re: [Patch] Scalar-List-Util tests should require XS part by Tels
• Re: [Patch] Scalar-List-Util tests should require XS part by Tels