silence obsolete when let et al warnings for emacs 31 #632
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What
Add EXTRA_COMP_FLAGS to control extra flags for byte and native
compilation.
Why
when-let et al are marked as obsolete from 31.1 and causes a lot of
warning messages that disturbs the output. As a quick fix introduce
the make macro so we can add settings to turn these warnings off. When
31.1 becomes closer to release we can deal with this.