[gimp] build: remove flatpak files duplicated in the flathub repository.

[Jehan Pagès <jehanp src gnome org>]

commit 63f830be4c299f877999ca6e9ffbceaada1fb651
Author: Jehan <jehan girinstud io>
Date:   Wed Dec 6 22:43:14 2017 +0100

    build: remove flatpak files duplicated in the flathub repository.
    
    The BaseApp json used for all 3 builds (stable, dev and nightly) is
    common so just keep the one made available in the flathub upstream
    repository. The patch also applies to the BaseApp only.

 build/flatpak/org.gimp.BaseApp.json          |  330 --------------------------
 build/flatpak/patches/webkitgtk-2.4.11.patch |   25 --
 2 files changed, 0 insertions(+), 355 deletions(-)