Unbreak WITH_DEBUG_X11_LOCAL_MOVESIZE without WITH_DEBUG_X11

WITH_DEBUG_X11_LOCAL_MOVESIZE is broken when building with WITH_DEBUG_X11=OFF:

```
/home/ch/Source/FreeRDP/client/X11/xf_event.c: In function `xf_event_suppress_events':
/home/ch/Source/FreeRDP/client/X11/xf_event.c:838:6: error: `X11_EVENT_STRINGS' undeclared (first use in this function)
/home/ch/Source/FreeRDP/client/X11/xf_event.c:838:6: note: each undeclared identifier is reported only once for each function it appears in
make[2]: *** [client/X11/CMakeFiles/xfreerdp.dir/xf_event.c.o] Error 1
make[2]: Leaving directory `/home/ch/Source/FreeRDP/obj-x86_64-linux-gnu'
make[1]: *** [client/X11/CMakeFiles/xfreerdp.dir/all] Error 2
make[1]: Leaving directory `/home/ch/Source/FreeRDP/obj-x86_64-linux-gnu'
make: *** [all] Error 2
```


This commit fixes it.