Remove workarounds for bad GCC-4 warnings

Arthurrequested to merge
arthurfeeney/eigen:remove-gcc-workarounds into master

Reference issue

No reference, just stumbled on these

What does this implement/fix?

Minor changes. This removes a few smelly workarounds that were done to avoid bad warnings in old versions of GCC.

Additional information

I ran tests with gcc 5.5 and didn't see any of the warnings mentioned. Also tried making these changes from the 3.4 branch, against gcc 4.9.

Edited by Arthur

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