Replace system() calls with proper Perl function use
Replace system() calls with proper Perl function use

Signed-off-by: Pedro Melo <3e267facec158a22a232125c74f1f09bceb68aac@simplicidade.org>

josl/App-perlbrew,dagolden/App-perlbrew,ptolemarch/App-perlbrew,calid/App-perlbrew,Asuza/App-perlbrew,calid/App-perlbrew,ptolemarch/App-perlbrew,rafl/App-perlbrew,josl/App-perlbrew,ptolemarch/App-perlbrew,rafl/App-perlbrew,Asuza/App-perlbrew,josl/App-perlbrew,dagolden/App-perlbrew,Asuza/App-perlbrew,rafl/App-perlbrew