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/cmMakefileLibraryTargetGenerator.h b/Source/cmMakefileLibraryTargetGenerator.h
index 307cd15..02fa029 100644
--- a/Source/cmMakefileLibraryTargetGenerator.h
+++ b/Source/cmMakefileLibraryTargetGenerator.h
@@ -15,11 +15,11 @@ class cmMakefileLibraryTargetGenerator : public cmMakefileTargetGenerator
 {
 public:
   cmMakefileLibraryTargetGenerator(cmGeneratorTarget* target);
-  ~cmMakefileLibraryTargetGenerator() CM_OVERRIDE;
+  ~cmMakefileLibraryTargetGenerator() override;
 
   /* the main entry point for this class. Writes the Makefiles associated
      with this target */
-  void WriteRuleFiles() CM_OVERRIDE;
+  void WriteRuleFiles() override;
 
 protected:
   void WriteObjectLibraryRules();