D20678: Ensure compatibility with Qt <5.10

[A. Wilcox]

awilcox created this revision.
awilcox added a project: Okular.
awilcox requested review of this revision.

REVISION SUMMARY
  Qt::AA_CompressTabletEvents was added in Qt 5.10.  Use preprocessor check
  to avoid build failures on 5.9 LTS or 5.8 (the minimum version).

TEST PLAN
  Build against Qt 5.9 LTS and 5.12 LTS.  Both built successfully.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D20678

AFFECTED FILES
  shell/main.cpp

To: awilcox
Cc: okular-devel, joaonetto, tfella, ngraham, darcyshen, aacid
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