Remove experimental Go bindings

Change-Id: I56f85055ca93bd8db4adb157467d0c1987859511
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/221656
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
4 files changed