#56 Compilation fails if JACK is not installed

[Romain LETENDART]

Hello,

Compilation of ZynAddSubFX fails if JACK is not installed.
"cmake" runs fine but when running "make" we get some include errors.

The reason for that is including "rtosc/thread-link.h" indirectly includes <jack ringbuffer.h="">.

I think it is a good thing to keep ZynAddSubFX compilable without JACK. So, in my opinion, "thread-link.h" shoud also provide an implementation which doesn't rely on JACK (maybe circular_buffer from the Boost library?).

[Mark McCurry]

It should be fixed for now.