qt: Support building with Qt 5.9
c68d80e23a86
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qt: Support building with Qt 5.9

* qt/pinlineedit.cpp (class PinLineEdit::Private): Add field q.
(PinLineEdit::Private::Private): New.
(PinLineEdit::Private::copyToClipboard): Remove obsolete parameter.
Use new field q instead.
(PinLineEdit::Private::selectionEnd): New.
(PinLineEdit::PinLineEdit): Pass this to Private.
(PinLineEdit::setFormattedPassphrase): Use new selectionEnd.
(PinLineEdit::copy): Call copyToClipboard without parameter.

QLineEdit::selectionEnd() exists since Qt 5.10. Provide an alternative
implementation for Qt 5.9 and earlier. This makes it possible to build
pinentry-qt on CentOS 7 which is used for building an AppImage.