[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at e285899 Do not intercept __libc_memalign and cfree on Android because neither of these exists in Bionic.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   e285899..5b68772  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 5b68772ca92cecb8ac9205f8e4523a5bc0c8e25e.
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!