[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 1dce692 Revert "[OpenMP] Add Error Handling for Conflicting Pointer Sizes for Target Offload"
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   1dce692..b326d4f  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to b326d4ff946d2061a566a3fcce9f33b484759fe0.
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!