[SYCL] Fix self build on windows. (#3845)

Fix to avoid error "default label in switch which covers all enumeration values" on windows self-build.

Signed-off-by: Zahira Ammarguellat <zahira.ammarguellat@intel.com>

Author: zahiraam

sycl/plugins/CMakeLists.txt

@@ -1,6 +1,6 @@
 set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
 
-if(NOT MSVC)
+if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-covered-switch-default")
 endif()