perl: backport a fix for parrallel build

SLAPOS-SR-TEST-MASTER sometimes reveal errors:

Can't locate Getopt/Long.pm in @INC (you may need to install the Getopt::Long module)
...
makefile:588: recipe for target 'cpan/podlators/pm_to_blib' failed
make: *** [cpan/podlators/pm_to_blib] Error 25

Backport a fix for this problem discussed at https://rt.perl.org/Public/Bug/Display.html?id=132360