Explicitly include the toolchain for clarity

Author: eregon

mx.graalpython/mx_graalpython.py

@@ -1000,7 +1000,7 @@ def verify_ci(dest_suite, common_ci_dir="ci_common", args=None, ext=('.jsonnet',
     dir_name='python',
     license_files=[],
     third_party_license_files=[],
-    dependencies=['pynl', 'Truffle', 'Sulong', 'TRegex'],
+    dependencies=['pynl', 'Truffle', 'Sulong', 'LLVM.org toolchain', 'TRegex'],
     truffle_jars=[
         'graalpython:GRAALPYTHON',
     ],