Use [[deprecated("msg")]] annotation only for C++ builds

Author: oleksandr-pavlyk

libsyclinterface/include/dpctl_sycl_device_interface.h

@@ -250,9 +250,11 @@ DPCTLDevice_GetMaxWorkItemSizes3d(__dpctl_keep const DPCTLSyclDeviceRef DRef);
  * @return   Returns the valid result if device exists else returns NULL.
  * @ingroup DeviceInterface
  */
-[[deprecated("Use DPCTLDevice_WorkItemSizes3d instead")]] DPCTL_API
-    __dpctl_keep size_t *
-    DPCTLDevice_GetMaxWorkItemSizes(__dpctl_keep const DPCTLSyclDeviceRef DRef);
+#if __cplusplus
+[[deprecated("Use DPCTLDevice_WorkItemSizes3d instead")]]
+#endif
+DPCTL_API __dpctl_keep size_t *
+DPCTLDevice_GetMaxWorkItemSizes(__dpctl_keep const DPCTLSyclDeviceRef DRef);
 
 /*!
  * @brief Wrapper for get_info<info::device::max_work_group_size>().