add old include/lib directory structure for ICX 2024, too.

The decision is not finalized yet, which folder layout the new ICX
release will have. We now add both versions and hope for the best.

common/cmake/dpcpp.cmake

@@ -143,19 +143,17 @@ IF (EMBREE_SYCL_SUPPORT)
   SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-pessimizing-move") # disabled: warning: moving a temporary object prevents copy elision [-Wpessimizing-move]
 
   IF (SYCL_ONEAPI_ICX AND WIN32)
-    if (${CMAKE_CXX_COMPILER_VERSION} VERSION_GREATER_EQUAL 2024.0)
+    IF (${CMAKE_CXX_COMPILER_VERSION} VERSION_GREATER_EQUAL 2024.0)
       SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I\"${SYCL_COMPILER_DIR}/../opt/compiler/include/sycl\" -I\"${SYCL_COMPILER_DIR}/../opt/compiler/include/sycl/sycl\"")       # disable warning from SYCL header
-    else()
-      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I\"${SYCL_COMPILER_DIR}/../include/sycl\" -I\"${SYCL_COMPILER_DIR}/../include/\"")       # disable warning from SYCL header
-    endif()
+    ENDIF()
+    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I\"${SYCL_COMPILER_DIR}/../include/sycl\" -I\"${SYCL_COMPILER_DIR}/../include/\"")       # disable warning from SYCL header
     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Qstd=c++17")
   ELSE()
     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
-    if (SYCL_ONEAPI_ICX AND ${CMAKE_CXX_COMPILER_VERSION} VERSION_GREATER_EQUAL 2024.0)
+    IF (SYCL_ONEAPI_ICX AND ${CMAKE_CXX_COMPILER_VERSION} VERSION_GREATER_EQUAL 2024.0)
       SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -isystem \"${SYCL_COMPILER_DIR}/../opt/compiler/include/sycl\" -isystem \"${SYCL_COMPILER_DIR}/../opt/compiler/include/sycl/sycl\"")       # disable warning from SYCL header
-    else()
-      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -isystem \"${SYCL_COMPILER_DIR}/../include/sycl\" -isystem \"${SYCL_COMPILER_DIR}/../include/\"")       # disable warning from SYCL header
-    endif()
+    ENDIF()
+    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -isystem \"${SYCL_COMPILER_DIR}/../include/sycl\" -isystem \"${SYCL_COMPILER_DIR}/../include/\"")       # disable warning from SYCL header
   ENDIF()
 
   # enable C++17 features