[clang][cmake] Remove extra brace

[VoltrexMaster]

Summary

Remove the extra trailing brace from the local variable accessor.

[phosek]

LGTM

clang/cmake/modules/AddClang.cmake

if(NOT lib_path MATCHES "^[.][.]")
         ${CLANG_SOURCE_DIR}/include/clang/${lib_path}/*.def
       )
       set_source_files_properties(${headers} PROPERTIES HEADER_FILE_ONLY ON)
 
       file( GLOB_RECURSE tds
         ${CLANG_SOURCE_DIR}/include/clang/${lib_path}/*.td
       )
       source_group("TableGen descriptions" FILES ${tds})
-      set_source_files_properties(${tds}} PROPERTIES HEADER_FILE_ONLY ON)
+      set_source_files_properties(${tds} PROPERTIES HEADER_FILE_ONLY ON)
 
       if(headers OR tds)
         set(srcs ${headers} ${tds})
       endif()
     endif()
   endif(MSVC_IDE OR XCODE)
   if(srcs OR ARG_ADDITIONAL_HEADERS)
     set(srcs