[glom] C++11: More use of override keyword.

[Murray Cumming <murrayc src gnome org>]

commit fbb0959c9dc5c745799e9fa6c80e371ef434e58b
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Oct 26 22:51:15 2015 +0100

    C++11: More use of override keyword.

 glom/libglom/connectionpool_backends/backend.h |    4 ++--
 glom/libglom/data_structure/glomconversions.cc |    3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/glom/libglom/connectionpool_backends/backend.h b/glom/libglom/connectionpool_backends/backend.h
index 356e9a6..7acaaf4 100644
--- a/glom/libglom/connectionpool_backends/backend.h
+++ b/glom/libglom/connectionpool_backends/backend.h
@@ -47,9 +47,9 @@ public:
   ExceptionConnection(failure_type failure);
   virtual ~ExceptionConnection() noexcept;
 
-  virtual const char* what() const noexcept;
+  virtual const char* what() const noexcept override;
 
-  virtual failure_type get_failure_type() const;
+  failure_type get_failure_type() const;
 
 private:
   failure_type m_failure_type;
diff --git a/glom/libglom/data_structure/glomconversions.cc b/glom/libglom/data_structure/glomconversions.cc
index 62455f2..e8835ae 100644
--- a/glom/libglom/data_structure/glomconversions.cc
+++ b/glom/libglom/data_structure/glomconversions.cc
@@ -343,8 +343,7 @@ class numpunct_thousands_separator: public std::numpunct<char>
 
 class numpunct_no_thousands_separator: public std::numpunct<char>
 {
-  //Override
-  std::string do_grouping() const
+  std::string do_grouping() const override
   {
     return "";
   };