ARMClang: Fix link line generation after addition of armlink support

Revise logic added by commit 73fb6ac8 (ARMClang: Add support for
armlink, 2020-06-02, v3.18.0-rc1~27^2).

Fixes: #21154

Modules/Compiler/ARMClang.cmake

@@ -115,11 +115,12 @@ macro(__compiler_armclang lang)
   endif()
 
   if(__CMAKE_ARMClang_USING_armlink)
+    unset(CMAKE_${lang}_LINKER_WRAPPER_FLAG)
     set(__CMAKE_ARMClang_USING_armlink_WRAPPER "")
   else()
-    set(__CMAKE_ARMClang_USING_armlink_WRAPPER ${CMAKE_${lang}_LINKER_WRAPPER_FLAG})
+    set(__CMAKE_ARMClang_USING_armlink_WRAPPER "-Xlinker")
   endif()
-  set(CMAKE_${lang}_LINK_EXECUTABLE "<CMAKE_LINKER> <CMAKE_${lang}_LINK_FLAGS> <LINK_FLAGS> <LINK_LIBRARIES> <OBJECTS> -o <TARGET> ${__CMAKE_ARMClang_USING_armlink_WRAPPER} --list <TARGET_BASE>.map")
+  set(CMAKE_${lang}_LINK_EXECUTABLE "<CMAKE_LINKER> <CMAKE_${lang}_LINK_FLAGS> <LINK_FLAGS> <LINK_LIBRARIES> <OBJECTS> -o <TARGET> ${__CMAKE_ARMClang_USING_armlink_WRAPPER} --list=<TARGET_BASE>.map")
   set(CMAKE_${lang}_CREATE_STATIC_LIBRARY  "<CMAKE_AR> --create -cr <TARGET> <LINK_FLAGS> <OBJECTS>")
   set(CMAKE_${lang}_ARCHIVE_CREATE         "<CMAKE_AR> --create -cr <TARGET> <LINK_FLAGS> <OBJECTS>")
   set(CMAKE_${lang}_RESPONSE_FILE_LINK_FLAG "${__CMAKE_ARMClang_USING_armlink_WRAPPER} --via=")