MQTT on Linux uses FMX.Types in TMS.MQTT.Logging.pas

TMS.MQTT.Logging.pas has in its uses fmx.types when compiling for linux.
Out of the box, there is no fmx for linux.
And if we use fmxLinux from Getit, then that introduces a dependency on some graphical linux packages, which again is not good if we want to run in a minimalistic docker container.

At this moment, TMS MQTT expects FMX Linux to be present to target Linux. Not sure if we can eliminate this dependency. We'll need to investigate this.