- Move DISTFILES setting back to master port exclusively as upstream had
used correct (coherent with v1.4) tags for v1.6 this time
- Register mutual port install-time conflict (CONFLICTS_INSTALL)
- Create convenience symlink in `post-extract' rather than `pre-patch',
because `200:dos2unix' bogusly(?) runs before `300:pre-patch'
- Since luxrays' library samples are not built as of r410138, do not try
to patch them (GC currently no-op patches)
- For the same reason, do not request GLUT, GLEW, and execinfo libraries
that were only used when building samples
- Convert FreeImage to an option (mandatory for v1.4) and default to off