Xcode: Remove unused member

It is unused since commit v3.4.0-rc1~492^2~3 (Remove
CMAKE_USE_RELATIVE_PATHS variable., 2015-06-01).

Source/cmGlobalXCodeGenerator.cxx

@@ -896,9 +896,6 @@ void cmGlobalXCodeGenerator::SetCurrentLocalGenerator(cmLocalGenerator* gen)
 {
   this->CurrentLocalGenerator = gen;
   this->CurrentMakefile = gen->GetMakefile();
-  std::string outdir = cmSystemTools::CollapseFullPath(
-    this->CurrentLocalGenerator->GetCurrentBinaryDirectory());
-  cmSystemTools::SplitPath(outdir, this->CurrentOutputDirectoryComponents);
 
   // Select the current set of configuration types.
   this->CurrentConfigurationTypes.clear();

Source/cmGlobalXCodeGenerator.h

@@ -241,7 +241,6 @@ private:
   std::string CurrentXCodeHackMakefile;
   std::string CurrentProject;
   std::set<std::string> TargetDoneSet;
-  std::vector<std::string> CurrentOutputDirectoryComponents;
   std::vector<std::string> ProjectSourceDirectoryComponents;
   std::vector<std::string> ProjectOutputDirectoryComponents;
   std::map<std::string, cmXCodeObject*> GroupMap;