deps: drop python3-distutils fixes #1345, also drop virtualenv

distutils was needed previous to the switch to pygobject, now the gobject library marks that package as needed if necessary, so there is no need for adding it explicitly

virtualenv is faster to install packages it was particularly notorious on numpy, but since i've dropped numpy and matplotlib, it doesn't make much difference and adds unnecesary dependencies

scripts/KlipperScreen-install.sh

@@ -6,7 +6,6 @@ KSENV="${KLIPPERSCREEN_VENV:-${HOME}/.KlipperScreen-env}"
 
 XSERVER="xinit xinput x11-xserver-utils xserver-xorg-input-evdev xserver-xorg-input-libinput xserver-xorg-legacy xserver-xorg-video-fbdev"
 CAGE="cage seatd xwayland"
-PYTHON="python3-virtualenv virtualenv python3-distutils"
 PYGOBJECT="libgirepository1.0-dev gcc libcairo2-dev pkg-config python3-dev gir1.2-gtk-3.0"
 MISC="librsvg2-common libopenjp2-7 wireless-tools libdbus-glib-1-dev autoconf"
 OPTIONAL="fonts-nanum fonts-ipafont libmpv-dev policykit-1 network-manager"
@@ -84,12 +83,6 @@ install_packages()
     echo_text "Installing KlipperScreen dependencies"
     sudo apt install -y $OPTIONAL
     echo "$_"
-    if sudo apt install -y $PYTHON; then
-        echo_ok "Installed Python dependencies"
-    else
-        echo_error "Installation of Python dependencies failed ($PYTHON)"
-        exit 1
-    fi
 
     if sudo apt install -y $PYGOBJECT; then
         echo_ok "Installed PyGobject dependencies"
@@ -119,7 +112,7 @@ create_virtualenv()
 {
     echo_text "Creating virtual environment"
     if [ ! -d ${KSENV} ]; then
-        virtualenv -p /usr/bin/python3 ${KSENV}
+        python3 -m venv  ${KSENV}
     fi
 
     source ${KSENV}/bin/activate

scripts/system-dependencies.json

@@ -1,8 +1,5 @@
 {
     "debian": [
-        "python3-virtualenv",
-        "virtualenv",
-        "python3-distutils",
         "libgirepository1.0-dev",
         "gcc",
         "libcairo2-dev",
@@ -20,7 +17,6 @@
         "autoconf"
     ],
     "arch": [
-        "python-virtualenv",
         "cairo",
         "pkgconf",
         "gobject-introspection",