graphics/py-python-poppler-qt5: revert incorrect commit

Revert "graphics/py-python-poppler-qt5: Fix build: Cannot import 'sipbuild.api'"

This reverts commit cc3975393535d0563e4dfad9638409e2fa90941d.

(cherry picked from commit f22db3e4c36ccfbc8e4f4f51000c0fb981b40981)