build: fix the tidy targets for autotools #15813
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To make them run clang-tidy correctly. clang-tidy occasionally finds mistakes none of the other static code analyzers we use finds.
Also added the
-clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling flag, to make it not complain about memcpy()
"make tidy" in the build root works fine now. The previous clang-tidy CI job was removed in e43c3b3. It is probably time to bring it back.