[SYCL] Silence pedantic warning for #warning directive in CL/sycl.hpp

Fixes #13592.

Author: aelovikov-intel

sycl/include/CL/sycl.hpp

@@ -9,7 +9,10 @@
 #pragma once
 
 #if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wpedantic"
 #warning "CL/sycl.hpp is deprecated, use sycl/sycl.hpp"
+#pragma clang diagnostic pop
 #endif
 
 #include <sycl/sycl.hpp>