[opengrm-ngram] Actually remove the unused patch.

[Jerry James]

commit a1d3c946066a68d84c9d5e48c7e0d4a4de8a8ca8
Author: Jerry James <jamesjer at betterlinux.com>
Date:   Fri May 2 11:05:44 2014 -0600

    Actually remove the unused patch.

 opengrm-ngram-warning.patch |   66 -------------------------------------------
 1 files changed, 0 insertions(+), 66 deletions(-)