Bugfix: Remove override keyword to avoid C++11 dependency

[JohnHalleyGotway]

Describe the Problem

Pull Request #2344 for issue #1943 added the override keyword to src/libcode/vx_seeps/seeps.h:

   void clear() override;

This change results in the unexpected adoption of the C++11 standard. And that change prompted this dtcenter/METplus#1991 discussion. While C++11 is very widely used and supported, some very old compiler versions do not support it.

Since the use of override is not required, recommend removing it from both the main_v11.0 and develop branches. And consider adopting and documenting the C++11 standard in a more formal, thorough way in the future.

While this will be changes in the main_v11.0 branch, it does NOT warrant a new bugfix release. Recommend waiting for additional bugfixes prior to cutting the 11.0.1 release.

Expected Behavior

MET should not yet require the C++11 standard.

Environment

Describe your runtime environment:
MET-11.0.0 compilation fails on Cray running GNU version 4.3.0.

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