reflect: add more stubs for encoding/binary

Package encoding/binary uses reflect and is needed by image/png, but
image/png doesn't actually need the reflect-using parts of
encoding/binary. So stub them out for now to get it to compile.

Thanks to Stephen Solka who wrote the patch.

src/reflect/type.go

@@ -65,6 +65,19 @@ func (t Type) Bits() int {
 	panic("unimplemented: (reflect.Type).Bits()")
 }
 
+func (t Type) Len() int {
+	panic("unimplemented: (reflect.Type).Len()")
+}
+
+func (t Type) NumField() int {
+	panic("unimplemented: (reflect.Type).NumField()")
+}
+
+func (t Type) Size() uintptr {
+	panic("unimplemented: (reflect.Type).Size()")
+}
+
 type StructField struct {
 	Name string
+	Type Type
 }

src/reflect/value.go

@@ -10,6 +10,10 @@ type Value struct {
 	value    *uint8
 }
 
+func Indirect(v Value) Value {
+	return v
+}
+
 func ValueOf(i interface{}) Value
 
 //go:linkname _ValueOf reflect.ValueOf
@@ -51,6 +55,10 @@ func (v Value) Addr() Value {
 	panic("unimplemented: (reflect.Value).Addr()")
 }
 
+func (v Value) CanSet() bool {
+	panic("unimplemented: (reflect.Value).CanSet()")
+}
+
 func (v Value) Bool() bool {
 	panic("unimplemented: (reflect.Value).Bool()")
 }