print_cpu_usage.c: Support non-consecutive CPUs
print_cpu_usage.c: Support non-consecutive CPUs

Fixes #308

Gravemind/i3status,lexszero/i3status,i3/i3status,i3/i3status,lexszero/i3status,Gravemind/i3status,peder2tm/i3status-netdev,peder2tm/i3status-netdev,lexszero/i3status,peder2tm/i3status-netdev,Gravemind/i3status,lexszero/i3status,Dettorer/i3status,Gravemind/i3status,Dettorer/i3status,Dettorer/i3status,i3/i3status,Dettorer/i3status,i3/i3status,peder2tm/i3status-netdev