* lang/qt/src/QGpgmeConfig-w32.cmake.in.in,
lang/qt/src/QGpgmeConfig.cmake.in.in,
lang/qt/src/QGpgmeConfigVersion.cmake.in: Files are part of QGpgME.
Fix copy&paste error (GPGME-CL -> QGpgME). Fix reference to license
to check for details.
* lang/qt/src/QGpgmeQt6Config-w32.cmake.in.in,
lang/qt/src/QGpgmeQt6Config.cmake.in.in,
lang/qt/src/QGpgmeQt6ConfigVersion.cmake.in: Files are part of QGpgME.
Fix reference to license to check for details.
--
The files were already licensed under the GPL but the license headers
contained multiple (copy&paste?) errors.
* lang/qt/src/QGpgmeConfig-w32.cmake.in.in,
lang/qt/src/QGpgmeQt6Config-w32.cmake.in.in: Get paths to check from
the target properties.
--
This avoids the error present in an older version where the files to
check used the correct path, but a wrong path of the DLL was set in the
target properties.
* configure.ac: Look for Qt 5 and/or Qt 6. Require C++17 if Qt 6 binding
is built. Build cmake files QGpgmeConfig* for Qt 5 and QGpgmeQt6Config*
for Qt 6.
(available_languages): Add "qt5" and "qt6".
(WANT_QT5, WANT_QT6): New conditionals.
* lang/qt/src/Makefile.am: Keep building libqgpgme for Qt 5. Build
libqgpgmeqt6 for Qt 6.
* lang/qt/tests/Makefile.am: Build tests for Qt 5 or Qt 6.
* lang/qt/src/QGpgmeQt6Config-w32.cmake.in.in,
lang/qt/src/QGpgmeQt6Config.cmake.in.in,
lang/qt/src/QGpgmeQt6ConfigVersion.cmake.in, m4/qt6.m4: New.
--
This makes it possible to build QGpgME optionally for Qt 6.4.0 or later.
By default or if the language "qt" is enabled, then QGpgME is built
either for Qt 5 (if found) or Qt 6. A build for Qt 5 or Qt 6 can be
requested by explicitly enabling the language "qt5" or "qt6". Building
QGpgME for Qt 5 and Qt 6 simultaneously is not supported.
