D10366: cmake: don't flag libnm-util as found when ModemManager is found

[Jan Grulich]

jgrulich accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R281 ModemManagerQt

BRANCH
  upstream-fixes

REVISION DETAIL
  https://phabricator.kde.org/D10366

To: aleksanderm, #frameworks, jgrulich
Cc: michaelh, ngraham