add missing extra-includes

these types have custom methods that need coord2d but don't require it to be included. this currently works but can't be guaranteed, so...

Author: ab9rf

df.block.xml

@@ -69,6 +69,7 @@
         <custom-methods>
             <cmethod name='has_assignments'/>
         </custom-methods>
+        <extra-include type-name='coord2d'/>
     </class-type>
 
     <class-type type-name='block_square_event_frozen_liquidst' inherits-from='block_square_event'>
@@ -221,6 +222,7 @@
         <custom-methods>
             <cmethod name='has_assignments'/>
         </custom-methods>
+        <extra-include type-name='coord2d'/>
     </struct-type>
 
     <struct-type type-name='map_block' original-name='blockst'>