Auto tests: revise cursor dependant tests

Auto tests: revise cursor dependant tests

Cursor dependant auto tests are currently skipped in various ways.
Some are checking PlatformQuirks::haveMouseCursor() that tries to
detect if the desktop environment is MeeGo, using obsolete Q_WS_X11.
Some are skipped if QT_NO_CURSOR or Q_OS_WINCE is defined and
some are actually missing the approriate guards.

=> unify by defining QTEST_NO_CURSOR in qtest-config.h when
appropriate ie. for platforms that have no regular mouse cursor
support or when QT_NO_CURSOR is defined.

Task-number: QTBUG-22551
Change-Id: I9a1e0e3156617945ae46226c79268955454c8a9a
Reviewed-by: Laszlo Papp <lpapp@kde.org>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Caroline Chao <caroline.chao@digia.com>