Remove ancient RPM packaging instructions

INSTALL.rst

@@ -41,47 +41,3 @@ If you installed Lutris using the setup.py script, you can launch the
 program by typing "lutris" at the command line. If you want to run
 Lutris without installing it, start "bin/lutris" from within the
 Lutris directory.
-
-Packaging
----------
-
-On Fedora:
-These instructions should let you build a Lutris on a minimal Fedora
-system such as a LXC container.
-
-Install required packaging tools::
-
-    yum install @development-tools
-    yum install fedora-packager
-    yum install python-devel
-
-Create a user to build the package with::
-
-    useradd makerpm
-    usermod -a -G mock makerpm
-    passwd makerpm
-
-Log out of the root account and login as the makerpm user then create the
-required directory structure::
-
-    rpmdev-setuptree
-
-You can now fetch the lutris sources either from a local drive or
-remotely::
-
-    cd ~/rpmbuild/SOURCES
-    curl -O  https://lutris.net/releases/lutris_0.3.7.tar.gz
-
-Extract the specs file from the archive::
-
-    cd ../SPECS/
-    tar xvzf ../SOURCES/lutris_0.3.7.tar.gz lutris/lutris.spec
-    mv lutris/lutris.spec .
-    rmdir lutris
-
-You can now build the RPM::
-
-    rpmbuild -ba lutris.spec
-
-The resulting package will be available at
-~/rpmbuild/RPMS/noarch/lutris-0.3.7-3.fc20.noarch.rpm