configure: Add warning to run make -C ui/gtk3 maintainer-clean-generic
#2773
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When users specify --disable-appindicator, --disable-xim, --disable-gtk3-wayland, --disable-emoji-dict options for configure, the behavior effects VALA files in ibus/ui/gtk3 and need to regenerate C files but many users don't know the steps so added a warning in the configure output to inform to run
make -C ui/gtk3 maintainer-clean-generic
of the users.BUG=#2767