Avoid warnings with MSVC 5.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34725 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/event.h

@@ -514,7 +514,9 @@ private:
 
 #ifdef __VISUALC__
     // 'this' : used in base member initializer list (for m_commandString)
-    #pragma warning(push)
+    #if _MSC_VER > 1100
+        #pragma warning(push)
+    #endif
     #pragma warning(disable:4355)
 #endif
 
@@ -580,7 +582,7 @@ private:
     DECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxCommandEvent)
 };
 
-#ifdef __VISUALC__
+#if defined(__VISUALC__) && (_MSC_VER > 1100)
     #pragma warning(pop)
 #endif