Add simple static checker based on clang-query#833

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real-or-random wants to merge 2 commits intobitcoin-core:masterfrom real-or-random:202010-clang-query

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Commits on Oct 22, 2020

Add simple static checker based on clang-query
real-or-random
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Commits on Nov 9, 2020

Add -Wreserved-id-macro to compile flags (only clang)
real-or-random
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