[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 83ac182 Hwasan reporting check for dladdr failing
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   83ac182..a6ac2b3  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to a6ac2b32fbab9679c8f2fa97a3b1123e3a9654c8.
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!