Fix use of deprecated OpenCL function

Also specify use of OpenCL 3.0 instead of depending on default.

CMakeLists.txt

@@ -40,3 +40,6 @@ target_link_libraries(DitheringProject PUBLIC
   ${PNG_LIBRARIES}
   ${FFMPEG_LIBAVCODEC_LINK_LIBRARIES}
 )
+
+target_compile_definitions(DitheringProject PRIVATE
+  CL_TARGET_OPENCL_VERSION=300)

src/opencl_handle.cc

@@ -780,7 +780,8 @@ OpenCLContext::OpenCLContext() : context_(nullptr), queue_(nullptr) {
   }
 
   // uses first available device
-  queue_ = clCreateCommandQueue(context_, devices.at(0), 0, &err_num);
+  queue_ = clCreateCommandQueueWithProperties(context_, devices.at(0), nullptr,
+                                              &err_num);
   if (err_num != CL_SUCCESS) {
     std::cout << "ERROR: OpenCLContext: Failed to create command queue"
               << std::endl;