When two instances of TBB were present, the system installed version would take
precedence over an explicitly specified TBB_LOCATION path. This change puts
TBB_LOCATION into the HINTS section and leaves the system paths in the PATHS
section.
cmake find_path function searchs system directories first when PATHS is used.
using HINTS instead forces the search to start in the suggested locations, which
ensures that the correct headers are used.
fixes#265
New text:
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