Add another 'using namespace shape' inside namespace shape

Try again to put out the darwin tinderbox

Author: brson

src/rt/rust_shape.cpp

@@ -35,6 +35,8 @@ const uint8_t CMP_LE = 2u;
 
 namespace shape {
 
+using namespace shape;
+
 // NB: This function does not align.
 template<typename T>
 inline data_pair<T>