[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 155ac33 [BuildLibCalls] Add noalias for strcat and stpcpy
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   155ac33..3d2bab1  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 3d2bab176f528de8d24512e092b2bfb319899b1e.
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!