Normalize whitespace in mac_bundles.bkl file

No real changes, just remove hard TABs and trailing spaces.

build/bakefiles/mac_bundles.bkl

@@ -67,7 +67,7 @@
 
                 <!-- copy the application icon: -->
                 cp -f $(BUNDLE_ICON) $(BUNDLE)/Resources/wxmac.icns
-	        </command>            
+                </command>
             <if cond="BUNDLE_RESOURCES!=''">
                 <command>
                     <!-- copy all other bundle resources: -->