D25531: kontact: simplify ksycoca-related startup code

[David Faure]

dfaure created this revision.
dfaure added reviewers: mlaurent, winterz.
Herald added a project: KDE PIM.
Herald added a subscriber: kde-pim.
dfaure requested review of this revision.

REVISION SUMMARY
  ksycoca is rebuilt in process these days, looping and waiting
  [for kbuildsycoca] makes no sense anymore [for a long time now].
  
  CCBUG: 414137

TEST PLAN
  deleted ksycoca file, started kontact, it said "rebuilding ksycoca"
  and started up fine

REPOSITORY
  R209 Kontact

BRANCH
  release/19.12

REVISION DETAIL
  https://phabricator.kde.org/D25531

AFFECTED FILES
  src/mainwindow.cpp
  src/mainwindow.h

To: dfaure, mlaurent, winterz
Cc: kde-pim, fbampaloukas, dcaliste, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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