D25356: Fix build with Qt 5.14

[Heiko Becker]

heikobecker created this revision.
heikobecker added a reviewer: KDE PIM.
Herald added a project: KDE PIM.
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REVISION SUMMARY
  std::hash<QString> is already specialized in Qt 5.14 [1], so we need
  to avoid redifining it with this version.
  
  [1] 4469e36d7203a55a4e158a50f0e9effc3f2fa3c2 in qtbase.git

TEST PLAN
  Builds fine with Qt 5.14.0-beta3

REPOSITORY
  R165 Akonadi

BRANCH
  release/19.12

REVISION DETAIL
  https://phabricator.kde.org/D25356

AFFECTED FILES
  src/shared/akstd.h

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