[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at c425094 [LLVM] Add libatomic load/store functions to TargetLibraryInfo
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   c425094..65936fe  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 65936fed1490dd1ef8d9a0a88b7d305b0840eb05.
CMake Error at CMakeLists.txt:6 (message):
  Your CMake version is 3.7.1.  The minimum version of CMake required to
  build LLVM is now 3.13.4.


-- Configuring incomplete, errors occurred!