appimage build: build and include libxcb-util1

fixes https://github.com/spesmilo/electrum/issues/8011

> Upgraded from Appimage 4.1.5 to 4.3.2 on MX-Linux 19.
> The new version fails to start with:
>
> ```
> $ electrum
> qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
> This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may > fix this problem.
>
> Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl, xcb.
>
> Aborted (core dumped)
> ```

debian 10 only distributes libxcb-util0.
debian 11 distributes libxcb-util1.
our base image atm is debian 10, so we build the package from source.

contrib/build-linux/appimage/Dockerfile

@@ -17,6 +17,7 @@ COPY apt.preferences /etc/apt/preferences.d/snapshot
 
 RUN apt-get update -q && \
     apt-get install -qy --allow-downgrades \
+        sudo \
         git \
         wget \
         make \
@@ -24,6 +25,7 @@ RUN apt-get update -q && \
         autoconf \
         libtool \
         autopoint \
+        pkg-config \
         xz-utils \
         libssl-dev \
         libssl1.1 \
@@ -41,9 +43,10 @@ RUN apt-get update -q && \
         gettext \
         libzbar0 \
         libdbus-1-3 \
+        xutils-dev \
         libxkbcommon0 \
         libxkbcommon-x11-0 \
-        libxcb1 \
+        libxcb1-dev \
         libxcb-xinerama0 \
         libxcb-randr0 \
         libxcb-render0 \
@@ -56,6 +59,7 @@ RUN apt-get update -q && \
         libxcb-image0 \
         libxcb-keysyms1 \
         libxcb-util0 \
+        #libxcb-util1 \
         libxcb-render-util0 \
         libx11-xcb1 \
         libc6-dev \