make cmLocalGenerator::EscapeForCMake() static

This way it can be used also if there is no cmLocalGenerator instance around

Alex

Source/cmLocalGenerator.h

@@ -251,7 +251,7 @@ public:
   std::string EscapeForShellOldStyle(const char* str);
 
   /** Escape the given string as an argument in a CMake script.  */
-  std::string EscapeForCMake(const char* str);
+  static std::string EscapeForCMake(const char* str);
 
   enum FortranFormat
     {