Point arraycontext at bcast-functions branch in req.txt

Author: inducer

requirements.txt

@@ -9,7 +9,7 @@ git+https://github.com/inducer/dagrt.git#egg=dagrt
 git+https://github.com/inducer/leap.git#egg=leap
 git+https://github.com/inducer/meshpy.git#egg=meshpy
 git+https://github.com/inducer/modepy.git#egg=modepy
-git+https://github.com/inducer/arraycontext.git#egg=arraycontext
+git+https://github.com/inducer/arraycontext.git@bcast-obj-attempt-2#egg=arraycontext
 git+https://github.com/inducer/meshmode.git#egg=meshmode
 git+https://github.com/inducer/pyvisfile.git#egg=pyvisfile
 git+https://github.com/inducer/pymetis.git#egg=pymetis