Use system installed clang-format only if newer, or bundled version is not executable #4968
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If a path to clang-format is configured explicitly, we'll use it. Otherwise, we will check for one on the system. If we find one on the system, we will:
- Try to invoke our own, to see if we can successfully do so, and to query its version.
- If we fail to invoke our own, use the one found on the system.
- If we successfully execute our own, try to invoke the one found on the system as well, to compare versions.
- If it fails to execute, use our own.
- If both are executable, use the one with the greater version.
This should address: #4963