[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at dae7b10 [lldb] Split out NetBSD/x86 watchpoint impl for unification
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   dae7b10..1cab3bf  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 1cab3bf0046117759cc7891eec66affbbeb5965c.
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!