ENH: add support for Intel Fortran Visual studio IDE

Source/cmGlobalVisualStudioGenerator.h

@@ -63,6 +63,9 @@ public:
    */
   virtual void CallVisualStudioMacro(MacroName m,
                                      const char* vsSolutionFile = 0);
+  
+  // return true if target is fortran only
+  bool TargetIsFortranOnly(cmTarget& t);
 
 protected:
   virtual void CreateGUID(const char*) {}