minor gpu tests fix

modules/gpu/test/test_imgproc.cpp

@@ -39,7 +39,9 @@
 //
 //M*/
 
-#include "precomp.hpp"
+#include "test_precomp.hpp"
+
+#ifdef HAVE_CUDA
 
 namespace {
 
@@ -1186,3 +1188,5 @@ INSTANTIATE_TEST_CASE_P(GPU_ImgProc, HoughLines, testing::Combine(
                     std::string("../cv/shared/pic6.png"))));
 
 } // namespace
+
+#endif // HAVE_CUDA