The crash is a bit due three different things:
 * QDateTime uses a shared global pointer to init the default QDateTime (this 
is changed in Qt 5.7)
 * MImSettings using a QScopedPointer for storing the factory
 * QSettings not setting the pendingChanges flag back to false after sync() is 
called

We can fix this problem by fixing any of the three and i think what
makes more sense is actually fixing QSettings since it seems a bug
anyway.

Upstream patch at https://codereview.qt-project.org/#/c/177557/

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https://bugs.launchpad.net/bugs/1642605

Title:
  maliit-framework segmentation fault with Qt 5.7.1

Status in maliit-framework package in Ubuntu:
  New

Bug description:
  It seems there is a segmentation fault with Qt 5.7.1 with maliit-
  framework as shown at https://launchpadlibrarian.net/293811765
  /buildlog_ubuntu-zesty-amd64.maliit-framework_0.99.1+git20151118
  +62bd54b-0ubuntu13~1_BUILDING.txt.gz

  --
  TESTING_IN_SANDBOX=1 TESTPLUGIN_PATH=../plugins 
TESTDATA_PATH=/<<BUILDDIR>>/maliit-framework-0.99.1+git20151118+62bd54b/tests 
LD_LIBRARY_PATH=../../lib:../../lib/plugins:../plugins: ./ut_mimsettings
  ********* Start testing of Ut_MImSettings *********
  Config: Using QtTest library 5.7.1, Qt 5.7.1 (x86_64-little_endian-lp64 
shared (dynamic) release build; by GCC 6.2.0 20161109)
  PASS   : Ut_MImSettings::initTestCase()
  PASS   : Ut_MImSettings::testValue()
  PASS   : Ut_MImSettings::testModifyValue()
  PASS   : Ut_MImSettings::testUnsetValue()
  PASS   : Ut_MImSettings::testModifyValueNotification()
  PASS   : Ut_MImSettings::testListDirs()
  PASS   : Ut_MImSettings::testListEntries()
  PASS   : Ut_MImSettings::cleanupTestCase()
  Totals: 8 passed, 0 failed, 0 skipped, 0 blacklisted, 44ms
  ********* Finished testing of Ut_MImSettings *********
  Segmentation fault (core dumped)
  Makefile:336: recipe for target 'check' failed
  make[4]: *** [check] Error 139
  --

  More information about Qt 5.7.1 at
  https://wiki.ubuntu.com/Touch/QtTesting

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