Fix compile error on 32 bits linux / windows, wireframe modifier needs padding.

Thanks to Scott Petrovic and Jia Wang for submitting fixes.

Differential Revision: http://developer.blender.org/D126
Differential Revision: http://developer.blender.org/D130

source/blender/makesdna/DNA_modifier_types.h

@@ -1331,6 +1331,7 @@ typedef struct WireframeModifierData {
 	float offset_fac_vg;
 	float crease_weight;
 	short flag, mat_ofs;
+	short pad[2];
 } WireframeModifierData;
 
 enum {