OIDN configure fails due to C++17 requirement

[sarnex]

Describe the bug

After the latest pulldown, we now require C++17.
This causes OIDN configure to fail:

CMake Error at devices/sycl/CMakeLists.txt:25 (message):
  Building with SYCL support requires oneAPI DPC++ Compiler as the C/C++
  compiler

From --debug-trycompile

[1/2] Building CXX object CMakeFiles/cmTC_9ec30.dir/src.cxx.o
FAILED: CMakeFiles/cmTC_9ec30.dir/src.cxx.o 
ccache /iusers/nsarnie/llvm_oidn/build/bin/clang++ -DOIDN_DEVICE_SYCL_SUPPORTED  -Wall -Wno-unknown-pragmas -Wno-pass-failed -Wno-unneeded-internal-declaration -fPIC -Wformat -Wformat-security     -fsycl -std=c++11 -MD -MT CMakeFiles/cmTC_9ec30.dir/src.cxx.o -MF CMakeFiles/cmTC_9ec30.dir/src.cxx.o.d -o CMakeFiles/cmTC_9ec30.dir/src.cxx.o -c /iusers/nsarnie/oidn/build/CMakeFiles/CMakeScratch/TryCompile-d47die/src.cxx
clang++: error: SYCL requires C++17 or later; '-std=c++11' is not supported
clang++: error: SYCL requires C++17 or later; '-std=c++11' is not supported
ninja: build stopped: subcommand failed.

My understanding after talking with the Driver team is this was supposed to be an existing requirement, but there was a bug in intel/llvm allowing older C++ versions and it was only caught when we implemented the requirement upstream.

To reproduce

No response

Environment

No response

Additional context

No response

[sarnex]

@atafra Can you please give your opinion on this?
It's unclear to me if this is just a CMake problem with the check_cxx_compiler_flag call and OIDN just needs to set CMAKE_REQUIRED_FLAGS before the call or if this is a bigger problem.
Thanks