closes 16162.

Avoid using file names and file paths for compatibility with
out-of-tree builds.

Note make and ccache don't track blacklist dependencies,
add workarounds.

Document use of coverity, clang static analyzer, and clang dynamic
undefined behavior and address sanitizers in doc/HACKING.

Add clang dynamic sanitizer blacklist in
contrib/clang/sanitizer_blacklist.txt to exempt known undefined
behavior. Include detailed usage instructions in this blacklist file.

Patch by "teor".