Update developer.md

Add information about preferring #pragma once even though it is not really a standard. Former-commit-id: 5ddde64d743d9b6a581a50bd6404f313800903de [formerly 2e5017e] Former-commit-id: 76a48f3b4c0804545b70fec758a89532a9bc49a2 Former-commit-id: 4b584cd875a98a05fc77a9a54667f957c57f8a2b
baconpaul · Jan 27, 2019 · 917375f · 917375f
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@@ -128,4 +128,6 @@ than that, perhaps toss in a comment.
 
 Prefer `std::ostringstream` and so on to `sprintf` and so on.
 
+`#pragma once`, while not [really standard](https://en.wikipedia.org/wiki/Pragma_once), is used in 
+most of the code, so we are continuing to use it rather than ifdef guards.