chore: add build log for zcg

src/RawTemplater/RawTemplaterArguments.h

@@ -20,6 +20,8 @@ public:
     std::vector<std::string> m_input_files;
     std::string m_output_directory;
 
+    // Generate a build log that is always written for the compiler to determine
+    // the last output time.
     std::string m_build_log_file;
 
     std::vector<std::pair<std::string, std::string>> m_defines;