bool OutputImageParam::defined() => bool OutputImageParam::defined() const
bool OutputImageParam::defined() => bool OutputImageParam::defined() const

Small fix to OutputImageParam constness.

Former-commit-id: e9fb6815d67245173f1d2a46a61cfc6d72be0a83
Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide