Update c++ test of butterfly balanced factorization for GPU use.

misc/test/src/C++/hierarchicalFactorizationButterflyBalanced.cpp.in

@@ -4,6 +4,10 @@
 #include "faust_TransformHelper.h"
 #include "faust_butterfly.h"
 
+#ifdef USE_GPU_MOD
+#include "faust_gpu_mod_utils.h"
+#endif
+
 typedef @TEST_FPP@ FPP;
 
 using namespace Faust;
@@ -12,6 +16,10 @@ using namespace std;
 
 int main(int argc, char** argv)
 {
+
+#ifdef USE_GPU_MOD
+	Faust::enable_gpu_mod();
+#endif
 	int log2dim;
 	if(argc >= 2)
 		log2dim = std::atoi(argv[1]);