perl: remove useless patch

The Perl infrastructure uses a host version of Module-Build
(see previous commit "host-perl-module-build: new package").
The target version is never used, so no need to patch it.

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>