simplify emitted debian/rules: don't add binary target unless necessary
simplify emitted debian/rules: don't add binary target unless necessary

sathieu/stdeb,pombredanne/stdeb,benthomasson/stdeb,pombredanne/stdeb,astraw/stdeb,LeMeteore/stdeb,LeMeteore/stdeb,benthomasson/stdeb,sathieu/stdeb,benthomasson/stdeb,sathieu/stdeb,pombredanne/stdeb,astraw/stdeb,LeMeteore/stdeb,astraw/stdeb