cmake: Make internal method file static

Source/cmake.cxx

@@ -2225,7 +2225,7 @@ bool cmake::IsMessageTypeVisible(cmake::MessageType t)
   return isVisible;
 }
 
-bool cmake::PrintMessagePreamble(cmake::MessageType t, std::ostream& msg)
+static bool printMessagePreamble(cmake::MessageType t, std::ostream& msg)
 {
   // Construct the message header.
   if (t == cmake::FATAL_ERROR) {
@@ -2312,7 +2312,7 @@ void cmake::IssueMessage(cmake::MessageType t, std::string const& text,
   }
 
   std::ostringstream msg;
-  if (!this->PrintMessagePreamble(t, msg)) {
+  if (!printMessagePreamble(t, msg)) {
     return;
   }
 

Source/cmake.h

@@ -500,8 +500,6 @@ private:
    * warning and error output CMake variables, in the cache.
    */
   bool IsMessageTypeVisible(cmake::MessageType t);
-
-  bool PrintMessagePreamble(cmake::MessageType t, std::ostream& msg);
 };
 
 #define CMAKE_STANDARD_OPTIONS_TABLE                                          \