Makefile: Provide a way to disable silent rules
Makefile: Provide a way to disable silent rules

Fixes #571

tchajed/pianobar,gnowxilef/pianobar,tchajed/pianobar,gnowxilef/pianobar,tchajed/pianobar,gnowxilef/pianobar,gnowxilef/pianobar,gnowxilef/pianobar,tchajed/pianobar,tchajed/pianobar,tchajed/pianobar,gnowxilef/pianobar