disable psycopg-c from dbapimain builds

disable psycopg-c from dbapimain builds

I don't know what this means.

ERROR:

Command errored out with exit status 1:
   command: /home/classic/tmp/foo/.venv/bin/python /home/classic/tmp/foo/.venv/lib/python3.10/site-packages/pip/_vendor/pep517/in_process/_in_process.py get_requires_for_build_wheel /tmp/tmp1x3hi09h
       cwd: /tmp/pip-install-yo6y28dm/psycopg-c_18eb2a0429dc438493454ed1051296ad
  Complete output (14 lines):
  error: Multiple top-level packages discovered in a flat-layout: ['psycopg', 'psycopg_c', 'psycopg_pool'].

  To avoid accidental inclusion of unwanted files or directories,
  setuptools will not proceed with this build.

  If you are trying to create a single distribution with multiple packages
  on purpose, you should not rely on automatic discovery.
  Instead, consider the following options:

  1. set up custom discovery (`find` directive with `include` or `exclude`)
  2. use a `src-layout`
  3. explicitly set `py_modules` or `packages` with a list of names

  To find more information, look for "package discovery" on setuptools docs.

Change-Id: I703ccd0a776fb7d0877acbbf919583102aa76fad