The files in obr/obr/ambisonic_binaural_decoder/binaural_filters cannot be compiled by cmake.

[jingbo-marquis]

When compiles obr by cmake, the files in obr/obr/ambisonic_binaural_decoder/binaural_filters are not compiled.
When to link the obr library, the following error is reported:
undefined reference to obr::BinauralFiltersWrapper::BinauralFiltersWrapper()' undefined reference to obr::BinauralFiltersWrapper::GetFile(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&) const'
undefined reference to `obr::BinauralFiltersWrapper::~BinauralFiltersWrapper()'

[trsonic]

Thank you for raising this error. This PR should fix it.

[jingbo-marquis]

Looks good.