VS: Fix detecting icx.exe with Intel Compiler toolsets newer than 2021

The logic added by commit 7808cbd644 (CMakeDetermineCompilerId: support
Intel DPC++ compiler toolset for VS gen, 2020-12-06, v3.20.0-rc1~330^2)
matches a specific toolset known to be the `icx.exe` compiler, and
assumes all other Intel C++ compilers (that are not DPC++) must be
`icl.exe`.

Since `icx.exe` is officially replacing `icl.exe`, use a regex that
matches the now-fixed set of toolsets known to use `icl.exe`.  Any other
Intel C++ compiler will be assumed to be `icx.exe`.

Signed-off-by: William R. Dieter <[email protected]>

Modules/CMakeDetermineCompilerId.cmake

@@ -319,15 +319,13 @@ Id flags: ${testflags} ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
       set(id_cl "$(CLToolExe)")
     elseif(CMAKE_VS_PLATFORM_TOOLSET MATCHES "v[0-9]+_clang_.*")
       set(id_cl clang.exe)
-    # Executable names have been chosen according documentation
-    # URL: (https://software.intel.com/content/www/us/en/develop/documentation/get-started-with-dpcpp-compiler/top.html#top_GUID-A9B4C91D-97AC-450D-9742-9D895BC8AEE1)
     elseif(CMAKE_VS_PLATFORM_TOOLSET MATCHES "Intel")
       if(CMAKE_VS_PLATFORM_TOOLSET MATCHES "DPC\\+\\+ Compiler")
         set(id_cl dpcpp.exe)
-      elseif(CMAKE_VS_PLATFORM_TOOLSET MATCHES "C\\+\\+ Compiler 2021")
-        set(id_cl icx.exe)
-      elseif(CMAKE_VS_PLATFORM_TOOLSET MATCHES "C\\+\\+ Compiler")
+      elseif(CMAKE_VS_PLATFORM_TOOLSET MATCHES "C\\+\\+ Compiler ([8-9]\\.|1[0-9]\\.|XE)")
         set(id_cl icl.exe)
+      elseif(CMAKE_VS_PLATFORM_TOOLSET MATCHES "C\\+\\+ Compiler")
+        set(id_cl icx.exe)
       endif()
     else()
       set(id_cl cl.exe)