Bug 1572724 - remove unused URL_REPO definition from build-clang.py; r=glandium

This definition is now unnecessary, given that the source code is
fetched for us from elsewhere.

Depends on D41368

Differential Revision: https://phabricator.services.mozilla.com/D41369

--HG--
extra : moz-landing-system : lando

build/build-clang/build-clang.py

@@ -23,8 +23,6 @@ from distutils.dir_util import copy_tree
 
 from shutil import which
 
-URL_REPO = "https://github.com/llvm/llvm-project"
-
 
 def symlink(source, link_name):
     os_symlink = getattr(os, "symlink", None)