Autobuilder: fall back when os.Executable fails
Autobuilder: fall back when os.Executable fails

This can happen under tracing, perhaps because of https://github.com/github/codeql-tracer/issues/29

github/codeql-go,github/codeql,github/codeql,github/codeql-go,github/codeql,github/codeql,github/codeql-go,github/codeql-go,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql