Removed unused member data

The clang compiler warned about an unused data member
Simplified code so clang could compile

The clang compiler issued an error about an expression it could not
yet parse. Simplifying the code allowed both gcc and clang to compile
the code.
Merge pull request #5304 from Dr15Jones/clangFixL1TriggerCSCTrackFinder

Clang fix problems in L1Trigger/CSCTrackFinder
Get clang to compile DataFormat/Math.
More clang fixes.
Even more clang fixes.
Limit damage from various vpp_generated.cpp

For some reason, even with -O1, vpp_generated.cpp take huge amount of
memory to compile.
Fix clang errors / warnings.

- These have been introduced recently. C++14 cannot come early enough.
Allow clang workaround to coexists with gcc flags.
Get ExtVec to compile properly with gcc.