GH-1096 make ubuntu package work on both 32bit and 64bit machines

application/package/ubuntu/multimc_1.1-1/DEBIAN/control

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+Package: multimc
+Version: 1.1-1
+Architecture: all
+Maintainer: Petr Mrázek <peterix@gmail.com>
+Section: games
+Priority: optional
+Installed-Size: 75
+Depends: zenity, default-jre
+Homepage: http://multimc.org
+Description: A local install wrapper for MultiMC
+

application/package/ubuntu/multimc_1.1-1/DEBIAN/postrm

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+#!/bin/sh
+set -e
+update-desktop-database

application/package/ubuntu/multimc_1.1-1/opt/multimc/run.sh

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+#!/bin/bash
+
+INSTDIR=~/.multimc
+if [ `getconf LONG_BIT` = "64" ]
+then
+    PACKAGE="mmc-stable-lin64.tar.gz"
+else
+    PACKAGE="mmc-stable-lin32.tar.gz"
+fi
+
+deploy() {
+    mkdir -p $INSTDIR
+    cd ${INSTDIR}
+
+    wget --progress=dot:force "http://files.multimc.org/downloads/${PACKAGE}" 2>&1 | sed -u 's/.* \([0-9]\+%\)\ \+\([0-9.]\+.\) \(.*\)/\1\n# Downloading at \2\/s, ETA \3/' | zenity --progress --auto-close --auto-kill --title="Downloading MultiMC..."
+
+    tar -xzf ${PACKAGE} --transform='s,MultiMC/,,'
+    rm ${PACKAGE}
+    chmod +x MultiMC
+    ./MultiMC
+}
+
+runmmc() {
+    cd ${INSTDIR}
+    ./MultiMC
+}
+
+if [[ ! -f ${INSTDIR}/MultiMC ]]; then
+    deploy
+else
+    runmmc
+fi

application/package/ubuntu/multimc_1.1-1/usr/share/applications/multimc.desktop

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+[Desktop Entry]
+Categories=Game;
+Exec=/opt/multimc/run.sh
+Icon=/opt/multimc/icon.svg
+Keywords=game;
+MimeType=
+Name=MultiMC 5
+Path=
+StartupNotify=true
+Terminal=false
+TerminalOptions=
+Type=Application
+X-DBUS-ServiceName=
+X-DBUS-StartupType=
+X-KDE-SubstituteUID=false
+X-KDE-Username=