[SYCL] Fix CMake external project args

ExternalProject_Add's CMAKE_ARGS requires a list of arguments, while
current behavior is to pass a string of arguments, which results in
build errors for some configurations. This patch changes type of
AUX_CMAKE_FLAGS from string to list.

Signed-off-by: Alexander Batashev <[email protected]>

Author: Alexander Batashev

sycl/CMakeLists.txt

@@ -91,16 +91,16 @@ if( NOT OpenCL_LIBRARIES )
   if(MSVC)
     set(OpenCL_LIBRARIES
         "${LLVM_LIBRARY_OUTPUT_INTDIR}/${CMAKE_STATIC_LIBRARY_PREFIX}OpenCL${CMAKE_STATIC_LIBRARY_SUFFIX}")
-    set(AUX_CMAKE_FLAGS "${AUX_CMAKE_FLAGS} -DOPENCL_ICD_LOADER_REQUIRE_WDK=OFF")
+    list(APPEND AUX_CMAKE_FLAGS -DOPENCL_ICD_LOADER_REQUIRE_WDK=OFF)
   else()
     set(OpenCL_LIBRARIES
         "${LLVM_LIBRARY_OUTPUT_INTDIR}/${CMAKE_SHARED_LIBRARY_PREFIX}OpenCL${CMAKE_SHARED_LIBRARY_SUFFIX}")
   endif()
   if (CMAKE_C_COMPILER)
-      set(AUX_CMAKE_FLAGS "${AUX_CMAKE_FLAGS} -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}")
+      list(APPEND AUX_CMAKE_FLAGS -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER})
   endif()
   if (CMAKE_CXX_COMPILER)
-      set(AUX_CMAKE_FLAGS "${AUX_CMAKE_FLAGS} -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}")
+      list(APPEND AUX_CMAKE_FLAGS -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER})
   endif()
   file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/icd_build)
   ExternalProject_Add(ocl-icd