[SYCL] Remove imf libdevice build warning on Windows (#20053)

Compiler warning reported when building imf libdevice on Windows:
imf_rounding_op.hpp: warning: constexpr if is a C++17 extension
[-Wc++17-extensions]

This PR fixes it.

Signed-off-by: jinge90 <[email protected]>

Author: jinge90

libdevice/cmake/modules/SYCLLibdevice.cmake

@@ -73,6 +73,7 @@ if(LLVM_LIBCXX_USED)
 endif()
 
 if (WIN32)
+  list(APPEND compile_opts "-std=c++17")
   list(APPEND compile_opts -D_ALLOW_RUNTIME_LIBRARY_MISMATCH)
   list(APPEND compile_opts -D_ALLOW_ITERATOR_DEBUG_LEVEL_MISMATCH)
 endif()
@@ -657,6 +658,10 @@ if(LLVM_LIBCXX_USED)
   list(APPEND  imf_host_cxx_flags "-stdlib=libc++")
 endif()
 
+if (WIN32)
+  list(APPEND imf_host_cxx_flags "-std=c++17")
+endif()
+
 macro(mangle_name str output)
   string(STRIP "${str}" strippedStr)
   string(REGEX REPLACE "^/" "" strippedStr "${strippedStr}")