PERL_LEVEL conditional dependencies

[Sergey Matveychuk]

Alan, Cheng-Lung Sung wrote:

> Yes, I thought it may not impact too much (only eye's checking :-/) . 
> Since every pr only need to read an extra file (bsd.perl.mk), and their 
> behavior should retain......

The patch I've sent contains fixes for 38 ports.
A script I've wrote detects 149 ports more with the same problems.

Oliver, is it real to run pointyhat if I'll fix them?

-- 
Sem.