perl-core/Math-BigInt: Bump to version 1.999.801 (masked)

perl-core/Math-BigInt: Bump to version 1.999.801 (masked)

Upstream:
- All mathematical methods except ->blog() no longer accept `undef` as operands.
- Add _lcm function to Math::BigInt::Lib
- Remove internal __lcm()
- BigInt and BigFloat can now use bgcd() and blcm() as class-methods.
- Prefer getting config values via `->config('name')` instead of  `->config()->{name}`
- Lock tests to their target libraries

Package-Manager: portage-2.3.2