Couple of initialiser-list fixes for the DSP module

modules/juce_dsp/maths/juce_Matrix.h

@@ -96,7 +96,7 @@ public:
     /** Returns an Array of 2 integers with the number of rows and columns in the
         matrix.
     */
-    Array<size_t> getSize() const noexcept             { return {{ rows, columns }}; }
+    Array<size_t> getSize() const noexcept             { return { rows, columns }; }
 
     /** Fills the contents of the matrix with zeroes. */
     void clear() noexcept                              { zeromem (data.begin(), sizeof (ElementType) * (size_t) data.size()); }

modules/juce_dsp/maths/juce_Polynomial.h

@@ -69,17 +69,15 @@ public:
     /** Creates a copy of another polynomial. */
     Polynomial& operator= (Polynomial&&) = default;
 
-   #if JUCE_COMPILER_SUPPORTS_INITIALIZER_LISTS || defined(DOXYGEN)
     /** Creates a new polynomial with coefficients by a C++11 initializer list.
         This function can be used in the following way:
         Polynomial<float> p ({0.5f, -0.3f, 0.2f});
     */
-    template <typename TypeToCreateFrom>
-    Polynomial (const std::initializer_list<TypeToCreateFrom>& items)  : coeffs (items)
+    template <typename... Values>
+    Polynomial (Values... items)  : coeffs (items...)
     {
         jassert (! coeffs.isEmpty());
     }
-   #endif
 
     //==============================================================================
     /** Returns a single coefficient of the receiver for reading */