[gnome-builder] build: Remove build/xdg-app folder

[Matthew Leeds <mwleeds src gnome org>]

commit 68800bd9b69f28b69b63ef156148fa8360610003
Author: Matthew Leeds <mleeds redhat com>
Date:   Fri Jul 15 16:56:31 2016 -0400

    build: Remove build/xdg-app folder
    
    This folder is no longer needed. To make a flatpak build of Builder, see
    this repo: https://git.gnome.org/browse/gnome-apps-nightly/

 build/xdg-app/.gitignore              |    5 -
 build/xdg-app/README.md               |   73 -----------
 build/xdg-app/build.sh                |  226 ---------------------------------
 build/xdg-app/build_helper.sh         |   38 ------
 build/xdg-app/gnome-builder-debug.def |    3 -
 build/xdg-app/gnome-builder.def       |   44 -------
 6 files changed, 0 insertions(+), 389 deletions(-)