Log Message:
hplip: fix botched patches and qt5 option packaging

When some patches were last updated, some incorrect changes were
inadvertently added. This broke some of the functionality, since there
were hard-coded paths added (e.g., "/usr/pkg/bin/python3.7").

Also fix qt5 option packaging so this actually builds again. There are
still issues that need investigation, but at least an executable can
now run and be interacted with (e.g., attaching as a plugin in Xfce).