In the FindTBB module, add the directory of the TBB includes and the
directory of the base tbb library to the list of paths to search for
TBB includes and libs, respectively. The reason is that TBB has its
initial includes and libraries and then has its support libraries.
Rather than enter entire paths 9 separate times, this allows you to
select the include directory once and one TBB library and the rest will
be automatically populated.