archlinux: disable check on unassigned pkgdir var

archlinux/PKGBUILD

@@ -66,6 +66,8 @@ package_qubes-vm-core() {
     optdepends=(gnome-keyring gnome-settings-daemon python-nautilus gpk-update-viewer qubes-vm-networking qubes-vm-keyring)
     install=PKGBUILD.install
 
+
+    # shellcheck disable=SC2154
     make install-corevm DESTDIR="$pkgdir" SBINDIR=/usr/bin LIBDIR=/usr/lib SYSLIBDIR=/usr/lib SYSTEM_DROPIN_DIR=/usr/lib/systemd/system USER_DROPIN_DIR=/usr/lib/systemd/user DIST=archlinux
     make -C app-menu install DESTDIR="$pkgdir" install LIBDIR=/usr/lib SYSLIBDIR=/usr/lib
     make -C misc install DESTDIR="$pkgdir" install LIBDIR=/usr/lib SYSLIBDIR=/usr/lib