Antonio Sanchez 7aee90b8d3 Fix fix<N> when variable templates are not supported.
There were some typos that checked `EIGEN_HAS_CXX14` that should have
checked `EIGEN_HAS_CXX14_VARIABLE_TEMPLATES`, causing a mismatch
in some of the `Eigen::fix<N>` assumptions.

Also fixed the `symbolic_index` test when
`EIGEN_HAS_CXX14_VARIABLE_TEMPLATES` is 0.

Fixes #2308


(cherry picked from commit 5db9e5c77958997856ddbccfa4a52ff22e83bef9)
2021-08-30 16:23:35 +00:00
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