cmMakefile: Remove AddExtraDirectory method.

It has no effect.

Source/cmAuxSourceDirectoryCommand.cxx

@@ -26,7 +26,6 @@ bool cmAuxSourceDirectoryCommand::InitialPass
 
   std::string sourceListValue;
   std::string templateDirectory = args[0];
-  this->Makefile->AddExtraDirectory(templateDirectory.c_str());
   std::string tdir;
   if(!cmSystemTools::FileIsFullPath(templateDirectory.c_str()))
     {

Source/cmMakefile.cxx

@@ -114,7 +114,6 @@ cmMakefile::cmMakefile(const cmMakefile& mf): Internal(new Internals)
   this->Internal->VarUsageStack.push(mf.Internal->VarUsageStack.top());
 
   this->Prefix = mf.Prefix;
-  this->AuxSourceDirectories = mf.AuxSourceDirectories;
   this->cmStartDirectory = mf.cmStartDirectory;
   this->StartOutputDirectory = mf.StartOutputDirectory;
   this->cmHomeDirectory = mf.cmHomeDirectory;
@@ -2256,11 +2255,6 @@ void cmMakefile::AddSourceGroup(const std::vector<std::string>& name,
 
 #endif
 
-void cmMakefile::AddExtraDirectory(const char* dir)
-{
-  this->AuxSourceDirectories.push_back(dir);
-}
-
 static bool mightExpandVariablesCMP0019(const char* s)
 {
   return s && *s && strstr(s,"${") && strchr(s,'}');

Source/cmMakefile.h

@@ -433,11 +433,6 @@ public:
   bool HasCMP0054AlreadyBeenReported(
     cmListFileContext context) const;
 
-  /**
-   * Add an auxiliary directory to the build.
-   */
-  void AddExtraDirectory(const char* dir);
-
   void MakeStartDirectoriesCurrent()
     {
       this->AddDefinition("CMAKE_CURRENT_SOURCE_DIR",
@@ -967,7 +962,6 @@ protected:
   void CheckForUnused(const char* reason, const std::string& name) const;
 
   std::string Prefix;
-  std::vector<std::string> AuxSourceDirectories; //
 
   std::string cmStartDirectory;
   std::string StartOutputDirectory;