Remove the SNMALLOC_USE_CXX17 C preprocessor symbol #667
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An attempt to simplify some
#ifdefmazes (for[[no_unique_address]]) led me to want to test the compiler more directly, which meant thatSNMALLOC_USE_CXX17was largely superfluous, so we can remove it in favor of testing pre-defined preprocessor symbols directly.In a little more detail, the prior definitions were not sufficient to detect when
[[no_unique_address]]would be accepted but ignored. That made deciding when we could kick on #637 by default more... interesting. With this, I hope to have a simpler time of things.