qt: Add support for Caps Lock hint on Wayland
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Description

qt: Add support for Caps Lock hint on Wayland

* configure.ac: Check for KF5WaylandClient. Add "-fpic" to CFLAGS.
Define PINENTRY_QT_WAYLAND if pinentry-qt should use KF5WaylandClient.
* qt/Makefile.am (BUILT_SOURCES, CLEANFILES, nodist_pinentry_qt_SOURCES):
Add capslock.moc.
(pinentry_qt_SOURCES): Add capslock.cpp.
* qt/capslock.cpp: New.
* qt/capslock.h (class CapsLockWatcher): New.
* qt/capslock_p.h: New.
* qt/capslock_unix.cpp (watchingWayland): New static.
(capsLockState): Log hint for using CapsLockWatcher on Wayland.
(CapsLockWatcher::Private::*): New.
* qt/pinentrydialog.cpp: Include config.h.
(PinEntryDialog::PinEntryDialog): Set up CapsLockWatcher.

This adds support for showing a warning if Caps Lock is on on Wayland.
Support for Wayland is optional when building pinentry depending on the
availability of the KF5WaylandClient library.