host-perl: export and rename PERL5LIB

The official Perl documentation refers only to PERL5LIB.
PERLLIB is obsolete, we don't need to be compatible with Perl4.

PERL5LIB is used in all environment, so it is simpler to just export it.

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

cpanminus was marked as broken, now it becomes useless with the Perl infrastructure.

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