cmMakefile: Remove unused CacheManager accessor.

Remove unneeded friend declarations from cmCacheManager.

Source/cmCacheManager.h

@@ -248,10 +248,8 @@ private:
   CacheEntryMap Cache;
   // Only cmake and cmMakefile should be able to add cache values
   // the commands should never use the cmCacheManager directly
-  friend class cmMakefile; // allow access to add cache values
   friend class cmState; // allow access to add cache values
   friend class cmake; // allow access to add cache values
-  friend class cmMarkAsAdvancedCommand; // allow access to add cache values
 };
 
 #endif

Source/cmMakefile.cxx

@@ -3735,11 +3735,6 @@ void cmMakefile::GetListOfMacros(std::string& macros) const
   macros = cmJoin(this->MacrosList, ";");
 }
 
-cmCacheManager *cmMakefile::GetCacheManager() const
-{
-  return this->GetCMakeInstance()->GetCacheManager();
-}
-
 cmState *cmMakefile::GetState() const
 {
   return this->GetCMakeInstance()->GetState();

Source/cmMakefile.h

@@ -12,7 +12,6 @@
 #ifndef cmMakefile_h
 #define cmMakefile_h
 
-#include "cmCacheManager.h"
 #include "cmExecutionStatus.h"
 #include "cmListFileCache.h"
 #include "cmPolicies.h"
@@ -765,7 +764,6 @@ public:
   ///enabled.
   void EnableLanguage(std::vector<std::string>const& languages, bool optional);
 
-  cmCacheManager *GetCacheManager() const;
   cmState *GetState() const;
 
   /**