[clang] [Clang][CMake] Fix header target creation (PR #180609)

[Alexey Bader via cfe-commits]

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@@ -516,8 +516,8 @@ foreach( f ${generated_files} )
   endif()
 endforeach( f )
 
-function(add_header_target target_name file_list)
-  add_library(${target_name} INTERFACE ${file_list})
+function(add_header_target target_name)
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bader wrote:

I see. Thanks for pointing that out.

https://github.com/llvm/llvm-project/pull/180609