[PATCH] plan9: add execute permissions to 9diff

[Steven Stallion]

# HG changeset patch
# User Steven Stallion <sstallion at gmail.com>
# Date 1334126420 25200
# Node ID 3321df470a4c976df079f6d0b3b1c00425d2b92b
# Parent  ee163a9cf37c5783b7707f3264e3be901255ce25
plan9: add execute permissions to 9diff