qpid-proton cmake line generates warnings

[alanking]

The following warning is printed after running the cmake step for building qpid-proton:

INFO -   stderr: CMake Warning:
  Manually-specified variables were not used by the project:

    BUILD_JAVA
    BUILD_PYTHON
    BUILD_RUBY

These variables should be removed as they are not being used.

[trel]

good find. new versions are more new.