fix for 2504: WITH_CUDA disabled with OSX in 2.4.3.

cmake/OpenCVDetectCUDA.cmake

@@ -3,8 +3,13 @@ if(${CMAKE_VERSION} VERSION_LESS "2.8.3")
   return()
 endif()
 
-if (NOT MSVC AND NOT CMAKE_COMPILER_IS_GNUCXX OR MINGW)
-  message(STATUS "CUDA compilation was disabled (due to unsuppoted host compiler).")
+if (WIN32 AND NOT MSVC)
+  message(STATUS "CUDA compilation is disabled (due to only Visual Studio compiler suppoted on your platform).")
+  return()
+endif()
+
+if (CMAKE_COMPILER_IS_GNUCXX AND NOT APPLE AND CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+  message(STATUS "CUDA compilation is disabled (due to Clang unsuppoted on your platform).")
   return()
 endif()