Disable RTO backoff when nc is set to 1
MD5 (kcptun-linux-amd64-20160823.tar.gz) = 338a519621bd88410d580160a1825a39
MD5 (kcptun-linux-386-20160823.tar.gz) = 20a74e757a2773e4be78d405db44faff
MD5 (kcptun-darwin-amd64-20160823.tar.gz) = 18de2fd625f7cbbfff38bf0c93234289
MD5 (kcptun-darwin-386-20160823.tar.gz) = 5c36b7a19cf19d1eeea778c97efa45bb
MD5 (kcptun-windows-amd64-20160823.tar.gz) = 35820143a8a4e31eb4448e263e32aa98
MD5 (kcptun-windows-386-20160823.tar.gz) = 1e3a94e872fa0bed6068787714f0cb7d
MD5 (kcptun-freebsd-amd64-20160823.tar.gz) = 9a3eff252f67550360b24fce89e38417
MD5 (kcptun-freebsd-386-20160823.tar.gz) = c1101fb8c84b735933f152939dae1a69
MD5 (kcptun-linux-arm-20160823.tar.gz) = 1e5272862a40f0bdc4e21d70ee3d0fb1