[PATCH] ifnames: Check for #elifdef and #elifndef

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Now that C23 and C++23 have #elifdef and #elifndef shouldn't ifnames
check for them? It seems that recent versions of gcc and clang support
it, though I'm not sure how many actually use it.

I've attached a patch that should work. Code that doesn't use them
shouldn't notice a difference.

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