[PATCH] Allow static List::Util but dynamic Math::BigInt::FastCalc

I'm suspicious that this extra dependency isn't doing anything useful,
but the attached keeps it from being harmful when List/Util is static.

• [PATCH] Allow static List::Util but dynamic Math::BigInt::FastCalc by Yitzchak Scott-Thoennes
• Re: [PATCH] Allow static List::Util but dynamic Math::BigInt::FastCalc by Nicholas Clark