cmMakefile: Remove redundant method duplication.

Source/cmMakefile.h

@@ -464,10 +464,6 @@ public:
       this->AddDefinition("CMAKE_CURRENT_SOURCE_DIR",
                           this->cmStartDirectory.c_str());
     }
-  const char* GetStartDirectory() const
-    {
-      return this->cmStartDirectory.c_str();
-    }
   void SetStartOutputDirectory(const std::string& dir)
     {
       this->StartOutputDirectory = dir;
@@ -478,10 +474,6 @@ public:
       this->AddDefinition("CMAKE_CURRENT_BINARY_DIR",
                           this->StartOutputDirectory.c_str());
     }
-  const char* GetStartOutputDirectory() const
-    {
-      return this->StartOutputDirectory.c_str();
-    }
   //@}
 
   const char* GetCurrentSourceDirectory() const