Don't let the fix for a Windows warning create warnings elsewhere

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@4752 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/audio/music_information.hpp

@@ -56,7 +56,9 @@ private:
     float                    m_time_since_faster;
 
 public:
+#if defined(WIN32) || defined(_WIN32)
 #pragma warning(disable:4290)
+#endif
                        MusicInformation (const std::string& filename) throw (std::runtime_error);
     const std::string& getComposer      () const {return m_composer;        }
     const std::string& getTitle         () const {return m_title;           }

src/race/grand_prix_data.hpp

@@ -49,7 +49,9 @@ class GrandPrixData
 public:
 
     /** Load the GrandPrixData from the given filename */
+#if defined(WIN32) || defined(_WIN32)
 #pragma warning(disable:4290)
+#endif
                        GrandPrixData  (const std::string filename) throw(std::logic_error);
                        GrandPrixData  ()       {}; // empty for initialising