[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 3a2645e [X86][SSE] Add HADD combine regression case from rG9bd97d036398
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   3a2645e..0462aef  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 0462aef5f359497b29bc811f94e8d6f7c1f2923e.
CMake Error at CMakeLists.txt:3 (cmake_minimum_required):
  CMake 3.13.4 or higher is required.  You are running version 3.7.1


-- Configuring incomplete, errors occurred!