make JNI Version check conditional
make JNI Version check conditional

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=740173

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