[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at f6275ca [gn build] Port 9870f77441c
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   f6275ca..8ef9e2b  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 8ef9e2bf355d05bc81d8b0fe1e5333eec59a0a91.
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!