disable some gpu tests if library was built without CUFFT(cherry picked from…

disable some gpu tests if library was built without CUFFT(cherry picked from commit b4b929d27cc25822dd15b5b96b8d335c59d4408c)

modules/gpu/perf/perf_imgproc.cpp

@@ -851,6 +851,8 @@ PERF_TEST_P(Sz_Depth_Cn, ImgProc_BlendLinear,
     }
 }
 
+#ifdef HAVE_CUFFT
+
 //////////////////////////////////////////////////////////////////////
 // Convolve
 
@@ -1085,6 +1087,8 @@ PERF_TEST_P(Sz_Flags, ImgProc_Dft,
     }
 }
 
+#endif
+
 //////////////////////////////////////////////////////////////////////
 // CornerHarris
 

modules/gpu/test/test_imgproc.cpp

@@ -563,6 +563,8 @@ INSTANTIATE_TEST_CASE_P(GPU_ImgProc, Blend, testing::Combine(
     testing::Values(MatType(CV_8UC1), MatType(CV_8UC3), MatType(CV_8UC4), MatType(CV_32FC1), MatType(CV_32FC3), MatType(CV_32FC4)),
     WHOLE_SUBMAT));
 
+#ifdef HAVE_CUFFT
+
 ////////////////////////////////////////////////////////
 // Convolve
 
@@ -1090,6 +1092,8 @@ GPU_TEST_P(Dft, R2CThenC2R)
 
 INSTANTIATE_TEST_CASE_P(GPU_ImgProc, Dft, ALL_DEVICES);
 
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////////
 // CornerHarris