Closed
Description
When starting Git from an unknown environment, chances are that PERL5LIB is set, and points to files that are incompatible with Git's shipped Perl. As we adjust the PATH to use Git's Perl, we need to take care to unset PERL5LIB, too.
To make this less of a hard-coded thing, let's add a config variable that makes it possible to configure which config variables (if any) need to be unset.