Fix missing `override`

Source/cmGlobalVisualStudioVersionedGenerator.cxx

@@ -206,8 +206,8 @@ class cmGlobalVisualStudioVersionedGenerator::Factory16
   : public cmGlobalGeneratorFactory
 {
 public:
-  virtual cmGlobalGenerator* CreateGlobalGenerator(const std::string& name,
-                                                   cmake* cm) const
+  cmGlobalGenerator* CreateGlobalGenerator(const std::string& name,
+                                           cmake* cm) const override
   {
     std::string genName;
     const char* p = cmVS16GenName(name, genName);
@@ -221,7 +221,7 @@ public:
     return 0;
   }
 
-  virtual void GetDocumentation(cmDocumentationEntry& entry) const
+  void GetDocumentation(cmDocumentationEntry& entry) const override
   {
     entry.Name = std::string(vs16generatorName);
     entry.Brief = "Generates Visual Studio 2019 project files.  "

Source/cmLocalGhsMultiGenerator.h

@@ -23,7 +23,7 @@ public:
   /**
    * Generate the makefile for this directory.
    */
-  virtual void Generate();
+  void Generate() override;
 
   std::string GetTargetDirectory(
     cmGeneratorTarget const* target) const override;