Comment away the extra checks in Configure

The "extra checks" is a debugging tool to check the config resolving
mechanism.  It uses Perl's smart match, which is experimental and
therefore always causes Perl to give out a warning, and it causes
older Perl versions to fail entirely.

So, it gets commented away, but stays otherwise in place, as it may be
useful again.

Reviewed-by: Matt Caswell <matt@openssl.org>