[12555] FindOpenSSL.cmake already ships with CMake

No reason for us to ship it too. Also, we had an outdated version which
had not been used anyway, because we set the include path in such a way,
that the CMake delivered version is always found first.
[12556] FindGit.cmake already ships with CMake

No reason for us to ship it too. Also, we had an outdated version which
had not been used anyway, because we set the include path in such a way,
that the CMake delivered version is always found first.