The build system targets make test-security-check, make -C src check-security and make -C src check-symbols run contrib/devtools/{test-,}{security,symbol}-check.py scripts from the top source directory, i.e. $(top_srcdir) in the current Autotools-based build system.
This renders needless of linking of those scripts into the build directory.
Both build systems, the current Autotools-based and the future CMake-based, benefit from this simplification.