vici: Update Python build

Directly calling setup.py is deprecated (apparently has been for a while,
but now we get large warnings).  Direct installation is also discouraged.
So this removes that option.  The built wheel (the old egg format is not
used/built anymore) can be installed manually in a venv or the like.

testing/scripts/build-baseimage

@@ -19,7 +19,7 @@ INC=$INC,openssl,vim,sqlite3,conntrack,gdb,cmake,libltdl-dev,wget,gnupg,man-db
 INC=$INC,libboost-thread-dev,libboost-system-dev,git,iperf,htop,valgrind,strace
 INC=$INC,gnat,gprbuild,acpid,acpi-support-base,libldns-dev,libunbound-dev
 INC=$INC,dnsutils,libsoup2.4-dev,ca-certificates,unzip,libsystemd-dev
-INC=$INC,python3,python3-setuptools,python3-dev,python3-daemon,python3-venv,
+INC=$INC,python3,python3-setuptools,python3-build,python3-dev,python3-daemon,python3-venv,
 INC=$INC,apt-transport-https,libjson-c-dev,libxslt1-dev,libapache2-mod-wsgi-py3
 INC=$INC,libxerces-c-dev,rsyslog
 case "$BASEIMGSUITE" in