The work to make wavpack a source-included library like all the other referenced libraries was almost complete, but not quite. This PR makes the libwavpack build optional like all the other builds, and source-includes libwavpack directly into libnyquist. The advantage is that consumers of libnyquist need only include libnyquist, rather than libnyquist and libwavpack
The work to make wavpack a source-included library like all the other referenced libraries was almost complete, but not quite. This PR makes the libwavpack build optional like all the other builds, and source-includes libwavpack directly into libnyquist. The advantage is that consumers of libnyquist need only include libnyquist, rather than libnyquist and libwavpack