Fix wxOSX build in 32 bits

Exclude code added in 92dc929b3f from build in
32 bit mode because it fails to compile, apparently due to missing Objective-C
runtime support for per-instance variables in 32 bit runtime.

src/osx/cocoa/dataview.mm

@@ -1252,6 +1252,14 @@ outlineView:(NSOutlineView*)outlineView
 // wxTextFieldCell
 // ============================================================================
 
+#ifndef _LP64
+    // The code below doesn't compile in 32 bits failing with
+    //
+    //      error: instance variables may not be placed in class extension
+    //
+    // Until this can be fixed, disable it to at least fix compilation.
+    #define wxTextFieldCell NSTextFieldCell
+#else
 @interface wxTextFieldCell ()
 {
     int _wxAlignment;
@@ -1324,6 +1332,7 @@ outlineView:(NSOutlineView*)outlineView
 }
 
 @end
+#endif // 32/64 bits
 
 
 // ============================================================================
@@ -2734,8 +2743,10 @@ void wxDataViewRenderer::OSXUpdateAlignment()
     int align = GetEffectiveAlignment();
     NSCell *cell = GetNativeData()->GetColumnCell();
     [cell setAlignment:ConvertToNativeHorizontalTextAlignment(align)];
+#ifdef _LP64
     if ([cell respondsToSelector:@selector(setWXAlignment:)])
         [(wxTextFieldCell*)cell setWXAlignment:align];
+#endif // _LP64
 }
 
 void wxDataViewRenderer::SetMode(wxDataViewCellMode mode)