Explicitly load re::regexp_pattern for 5.10.0
Explicitly load re::regexp_pattern for 5.10.0

Before then, it wasn't available; afterwards it was always available.

dagolden/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,kainwinterheart/mongo-perl-driver,jorol/mongo-perl-driver,mongodb/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,gormanb/mongo-perl-driver,dagolden/mongo-perl-driver,xdg/mongo-perl-driver,xdg/mongo-perl-driver,kainwinterheart/mongo-perl-driver,dagolden/mongo-perl-driver,gormanb/mongo-perl-driver,gormanb/mongo-perl-driver,jorol/mongo-perl-driver,kainwinterheart/mongo-perl-driver,kainwinterheart/mongo-perl-driver,xdg/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,jorol/mongo-perl-driver,gormanb/mongo-perl-driver,dagolden/mongo-perl-driver,mongodb/mongo-perl-driver,mongodb/mongo-perl-driver,jorol/mongo-perl-driver