Math: std::hypot() is not available in NaCl newlib.

Probably bug / not-yet-implemented feature.

src/Math/Complex.h

@@ -339,7 +339,12 @@ template<class T> class Complex {
          * @see isNormalized()
          */
         inline T length() const {
+            /** @todo Remove when NaCl's newlib has this fixed */
+            #ifndef CORRADE_TARGET_NACL_NEWLIB
             return std::hypot(_real, _imaginary);
+            #else
+            return std::sqrt(dot());
+            #endif
         }
 
         /**