libssh2_session_flag(LIBSSH2_SESSION *session, int flag, int value);
Set options for the created session. flag is the option to set, while
value is typically set to 1 or 0 to enable or disable the option.
If set, libssh2 will not attempt to block SIGPIPEs but will let them trigger
from the underlying socket layer.
If set - before the connection negotiation is performed - libssh2 will try to
negotiate compression enabling for this connection. By default libssh2 will
not attempt to use compression.
Returns regular libssh2 error code.
This function has existed since the age of dawn. LIBSSH2_FLAG_COMPRESS was
added in version 1.2.8.