x11-toolkits/wlroots: add missing runtime dependencies

[xwayland/xwayland.c:141] failed to exec Xwayland: No such file or directory

xkbcommon: ERROR: failed to add default include path /usr/local/share/X11/xkb
[rootston/keyboard.c:421] Cannot create XKB context
[rootston/seat.c:660] could not allocate keyboard for seat