fix implicit function warning for g_sprintf
fix implicit function warning for g_sprintf

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=743150

thisMagpie/java-atk-wrapper,thisMagpie/java-atk-wrapper,GNOME/java-atk-wrapper,GNOME/java-atk-wrapper,thisMagpie/java-atk-wrapper,GNOME/java-atk-wrapper