Removing static binaries (doxygen, doxytag) from CMSSW

Doxygen 1.8.4 added to PATH as CMSSW external package

Signed-off-by: Mantas <cmsdoxy@cern.ch>
Merge pull request #611 from cmsdoxy/remove-doxygen-binaries

Removing static binaries (doxygen, doxytag) from CMSSW