suppress more float/double->int conversion warnings to be able to see anything else in wxOSX/Cocoa build

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61146 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/cocoa/notebook.mm

@@ -106,10 +106,10 @@ public:
     {
         wxNSTabView* slf = (wxNSTabView*) m_osxView;
         NSRect r = [slf contentRect];
-        left = r.origin.x;
-        top = r.origin.y;
-        width = r.size.width;
-        height = r.size.height;
+        left = (int)r.origin.x;
+        top = (int)r.origin.y;
+        width = (int)r.size.width;
+        height = (int)r.size.height;
     }
     
     void SetValue( wxInt32 value )