jacko: fixed a segfault removing the unused JackSessionID option
jacko: fixed a segfault removing the unused JackSessionID option

The macro JackOpenOptions hides JackSessionID that causes a segfault
because the session-id optarg is not present in `jack_client_open'.
The crash depends on the implementation of the `va_arg' macro,
called by the `jack_varargs_parse' function (jack1 and jack2).

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