cmLocalGenerator: Require a global generator in the constructor.

Port generator factory methods to pass it.

Source/cmLocalGenerator.h

@@ -33,7 +33,7 @@ class cmCustomCommandGenerator;
 class cmLocalGenerator
 {
 public:
-  cmLocalGenerator(cmLocalGenerator* parent);
+  cmLocalGenerator(cmGlobalGenerator* gg, cmLocalGenerator* parent);
   virtual ~cmLocalGenerator();
 
   /**
@@ -88,9 +88,6 @@ public:
   const cmGlobalGenerator *GetGlobalGenerator() const {
     return this->GlobalGenerator; }
 
-  ///! Set the Global Generator, done on creation by the GlobalGenerator
-  void SetGlobalGenerator(cmGlobalGenerator *gg);
-
   /**
    * Convert something to something else. This is a centralized conversion
    * routine used by the generators to handle relative paths and the like.