If a package contains .cpp files, CMake produces the following error:
```
CMake Error: Cannot determine link language for target <package-target>.
CMake Error: CMake can not determine linker language for target: 
<package-target>
```

Adding CXX to project languages if no package contains .cpp files doesn't 
affect the build.

[ Full content available at: https://github.com/apache/mynewt-newt/pull/210 ]
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