kconfig: qconf: convert to Qt5 new signal/slot connection syntax
Now that the Qt4 support was dropped, we can use the new connection syntax supported by Qt5. It provides compile-time checking of the validity of the connection. Previously, the connection between signals and slots were checked only run-time. Commit d85de339 ("kconfig: qconf: fix signal connection to invalid slots") fixed wrong slots. This change makes it possible to catch such mistakes easily. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Boris Kolpackov <boris@codesynthesis.com>
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