[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 44a11c3 [OpenMP] Use explicit type casting in kmp_atomic.cpp
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   44a11c3..bc98034  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to bc9803404042aa45417cf4f6925fb06b44f1ad93.
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!