AROS: 32/64-bit fix field alignment for unit commodities

Make sure AROS' record structures are C-packed.

packages/arosunits/src/commodities.pas

@@ -12,7 +12,7 @@
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
  **********************************************************************}
-{$PACKRECORDS 2}
+{$PACKRECORDS C}
 unit commodities;
 
 interface