[Cin] FreeBSD release

[mnieuw at zap.a2000.nl]

I tried the FreeBSD 13 pre-built CinGG on a fully updated FreeBSD 13.

After installing packages openexr, flac and
libsndfile, CinGG failed to start, with weird errors.

- It could not create the .bcast5 directory, although the path it showed
  in the error message was correct.
- It tried to put plugins into /plugin .
- And maybe because of that, very many errors on plugins.

Certainly the first two should be easy to debug, unfortunately I
cannot build from sources. Configure stops at needing gkt2+ . I am
running the XFCE desktop, so gtk2 must be present, it is probably some
gkt2 development files that are missing.
"pkg search" shows nothing that looks like it .

@Andrew-R , you must have this working. Which package is required?

MatN