perl: Add basic test support

Signed-off-by: Marcel Denia <naoir@gmx.net>
perl: Set nv_overflows_integers_at configuration symbol

Signed-off-by: Marcel Denia <naoir@gmx.net>
perl: Also strip begin, end and for pragmas

Signed-off-by: Marcel Denia <naoir@gmx.net>
perl: Update perlbase.mk

Signed-off-by: Marcel Denia <naoir@gmx.net>
perl: Fix signal order for i486

Signed-off-by: Marcel Denia <naoir@gmx.net>
perl: Mark test support as experimental

Signed-off-by: Marcel Denia <naoir@gmx.net>
perl: Update to 5.20.1

Signed-off-by: Marcel Denia <naoir@gmx.net>