[gtk2] Drop an unused patch

[Kalev Lember]

commit df927d1e414893770ac9911a6fc8845d0c33a9c4
Author: Kalev Lember <kalevlember at gmail.com>
Date:   Mon Aug 25 20:40:26 2014 +0200

    Drop an unused patch

 ...ne-Fix-the-build-with-Werror-format-secur.patch |   25 --------------------
 1 files changed, 0 insertions(+), 25 deletions(-)