Fixing compilation issues cause by a bad merge.

math/src/common.cpp

@@ -21,7 +21,7 @@ namespace math {
     return {{vcos[0] - vsin[1] + c[0], vsin[0] - vcos[1] + c[1]}};
   }
 
-  quad rotate(vec2 const & c, quad const & q, radian r) {
+  dim2::quad rotate(vec2 const & c, dim2::quad const & q, radian r) {
     return {rotate(c, q.ll, r), rotate(c, q.lr, r), rotate(c, q.ur, r),
             rotate(c, q.ul, r)};
   }