Hello. Upstream now requires backports-shutil_get_terminal_size and backports-shutil_which for python-2 (see URL). Note that backports-shutil_which is missing from tree atm. Please fix.
Fixed in commit d377f979b7ff6cbb1185dc02b18b4770eff56a3f Author: soredake <fdsfgs@krutt.org> AuthorDate: Sun Mar 5 04:16:46 2017 +0200 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Sun Mar 5 15:37:36 2017 +0100 net-misc/streamlink: update live ebuild