If a Go struct or interface has the same name as its package class, append an underscore to the generated Java class name. Fixes golang/go#23327. Change-Id: Ib680af35c956801073a0effb510a3ed9bbb8b9d1 Reviewed-on: https://go-review.googlesource.com/87656 Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>