main/libssh2: re-enable tests
tests were disabled in 78e15fb8
1.11.0 release notes mention "Improvements to unit tests" https://github.com/libssh2/libssh2/releases/tag/libssh2-1.11.0
tests were disabled in 78e15fb8
1.11.0 release notes mention "Improvements to unit tests" https://github.com/libssh2/libssh2/releases/tag/libssh2-1.11.0