[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 4341c66 [OPENMP]Do not allow threadprivates as base for array-like reduction.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   4341c66..8c0dc1e  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 8c0dc1e38b6c1a2d35c66ac4b0c1ccd616dd1685.
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!