Fix klanfalter build with SSE (includes header inside namespace)

Signed-off-by: falkTX <falktx@falktx.com>

ports/klangfalter/source/FFTConvolver/Utilities.h

@@ -25,9 +25,6 @@
 #include <new>
 
 
-namespace fftconvolver
-{
-
 #if defined(__SSE__) || (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
   #if !defined(FFTCONVOLVER_USE_SSE) && !defined(FFTCONVOLVER_DONT_USE_SSE)
     #define FFTCONVOLVER_USE_SSE
@@ -46,6 +43,9 @@ namespace fftconvolver
   #define FFTCONVOLVER_RESTRICT
 #endif
 
+namespace fftconvolver
+{
+
 
 /**
 * @brief Returns whether SSE optimization for the convolver is enabled