Use C++11 override instead of CM_OVERRIDE

We now require C++11 support including `override`.  Drop use of
the old compatibility macro.  Convert references as follows:

    git grep -l CM_OVERRIDE -- '*.h' '*.hxx' '*.cxx' |
      xargs sed -i 's/CM_OVERRIDE/override/g'

1 files changed, 2 insertions, 2 deletions

diff --git a/Source/cmNinjaNormalTargetGenerator.h b/Source/cmNinjaNormalTargetGenerator.h
index d8baa67b13..01cc8816e1 100644
--- a/Source/cmNinjaNormalTargetGenerator.h
+++ b/Source/cmNinjaNormalTargetGenerator.h
@@ -16,9 +16,9 @@ class cmNinjaNormalTargetGenerator : public cmNinjaTargetGenerator
 {
 public:
   cmNinjaNormalTargetGenerator(cmGeneratorTarget* target);
-  ~cmNinjaNormalTargetGenerator() CM_OVERRIDE;
+  ~cmNinjaNormalTargetGenerator() override;
 
-  void Generate() CM_OVERRIDE;
+  void Generate() override;
 
 private:
   std::string LanguageLinkerRule() const;