Fix build in gtk-input-context/ by adding missing plugin_settings_change function
Fix build in gtk-input-context/ by adding missing plugin_settings_change function

RevBy: TrustMe

Full, original commit at 62b563e8c7516583d6beee711729ad4f038282b6 in maliit-framework

maliit/inputcontext-gtk,maliit/inputcontext-gtk