maintainer-feedback requested: [Bug 293955] deskutils/kdepim-runtime: fix build with clang 21

Bugzilla Automation <[email protected]> has asked freebsd-kde (group)
<[email protected]> for maintainer-feedback:
Bug 293955: deskutils/kdepim-runtime: fix build with clang 21
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293955



--- Description ---
With clang 21 deskutils/kdepim-runtime fails to build, with errors
similar to:

    ld: error: undefined symbol: KPIM::Maildir::Maildir(QString const&, bool)
    >>> referenced by configwidget.cpp
    >>> 	     
CMakeFiles/mixedmaildirconfig.dir/configwidget.cpp.o:(ConfigWidget::checkPath()
)
    >>> referenced by configwidget.cpp
    >>> 	     
CMakeFiles/mixedmaildirconfig.dir/configwidget.cpp.o:(ConfigWidget::checkPath()
)

    ld: error: undefined symbol: KPIM::Maildir::isValid(bool) const
    >>> referenced by configwidget.cpp
    >>> 	     
CMakeFiles/mixedmaildirconfig.dir/configwidget.cpp.o:(ConfigWidget::checkPath()
)
    >>> referenced by configwidget.cpp
    >>> 	     
CMakeFiles/mixedmaildirconfig.dir/configwidget.cpp.o:(ConfigWidget::checkPath()
)

This is because various CMake configure checks fail, due to the port
Makefile adding -Wno-error=enum-constexpr-conversion, which is no longer
supported by clang >= 21.