bug#15604: [coreutils] [PATCH] md5sum: Add option to ignore non-existant files

[Pádraig Brady]

> I'll push a bit later today.

Pushed at 
http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff;h=v8.24-91-g9fd0662
Marking http://bugs.gnu.org/15604 done