This change strips out all descriptor option fields marked with [retention = RETENTION_SOURCE] before writing the FileDescriptor to the generated go code bindings.
Change-Id: Ie624d9d4b4f211a256661d80a04199ae8401662b
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/472696
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Lasse Folger <lassefolger@google.com>
