component/proftpd: build with slapos ncurses

to prevent using system package when ncurses-dev is installed
4 jobs for fix/debian12-and-libncurses-dev in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-TestRunner1.Python2

00:18:39

passed SlapOS.Eggs.UnitTest-TestRunner1.Python3

00:26:09

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

07:09:46

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1-DebianNext

26:31:37