[dataimport] Fix use of _create_copyfrom_buffer() (related to #3845572)
This is used indirectly by SQLGenObjectStore when running on a
PostgreSQL database.
Regression introduced by commit 70056633085c.
include *.py
include */*.py
recursive-include data *.gif *.png *.ico *.css *.js
recursive-include i18n *.po
recursive-include wdoc *