Enable empty base class optimization on MSVC #66
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...so that sizeof(RNG) matches expected values in tests
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MSVC implements empty base class optimization only as an opt-in (see https://devblogs.microsoft.com/cppblog/optimizing-the-layout-of-empty-base-classes-in-vs2015-update-2-3/).
Because of this, the tests fail on MSVC as the engines are larger than expected.
By using the attribute to opt-in to EBCO, the engines are of the expected sizes.