empty such reference is 0, not nil.

These special cases were introduced in Go 1.10. For auto-updating code
from Go 1.9 and earlier, use the cftype or jni rewrites in the Go fix tool:

	go tool fix -r cftype <pkg>
	go tool fix -r jni <pkg>

It will replace nil with 0 in the appropriate places.

The EGLDisplay case was introduced in Go 1.12. Use the egl rewrite

	if goos != "darwin" && goos != "ios" {
		return false
	}
	s := dt.Name
	if !strings.HasSuffix(s, "Ref") {
		return false
	}
	s = s[:len(s)-3]
	if s == "CFType" {
		return true
	}
	if c.getTypeIDs[s] {
		return true
	}
	if i := strings.Index(s, "Mutable"); i >= 0 && c.getTypeIDs[s[:i]+s[i+7:]] {
		// Mutable and immutable variants share a type ID.