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4b10302fd8
Very often, especially since reg-tests, it would be desirable to be able to conditionally comment out a config block, such as removing an SSL binding when SSL is disabled, or enabling HTX only for certain versions, etc. This patch introduces a very simple nested block management which takes ".if", ".elif", ".else" and ".endif" directives to take or ignore a block. For now the conditions are limited to empty string or "0" for false versus a non-nul integer for true, which already suffices to test environment variables. Still, it needs to be a bit more advanced with defines, versions etc. A set of ".notice", ".warning" and ".alert" statements are provided to emit messages, often in order to provide advice about how to fix certain conditions.