Bug#1115978: r-cran-filehash: autopkgtest fail - hash mismatch

[Rebecca N. Palmer]

Control: tags -1 pending

On further investigation, no, it's actually that the references are for 
a UTF-8 locale while our test runner script was setting LC_ALL=C; 
switching to C.UTF-8 fixed both this and #932344 (= upstream 15).