Fix a typo
Fix a typo

$(bindir) starts with a slash, so no need to add an extra one in
$(DESTDIR)$(bindir)...

https://bugzilla.gnome.org/show_bug.cgi?id=734563

Distrotech/gtk,Distrotech/gtk,Distrotech/gtk,Distrotech/gtk,johne53/MB3Gtk-2,johne53/MB3Gtk-2,johne53/MB3Gtk-2,johne53/MB3Gtk-2,johne53/MB3Gtk-2,Distrotech/gtk