Readd drawtext plugin for 32-Bit Intel on Linux.
Screen: Always apply maxStddev for sync tests from preference settings.

Not only if a desktop compositor is detected! Now we always take
the preference setting for sync test pass thresholds into account.

If a compositor is active on a non-Linux system we do apply 5x
the preference setting for max. stddev though to be more lenient
to inferior systems.
Screen/Linux: Select specially named drawtext plugin on ARM architecture.

On Linux, if running on a ARM architecture processor, select the
text plugin which is suffixed arm or arm64 before trying the
generic name.

This doesn't matter for NeuroDebian/Debian/Ubuntu packaged PTB's, as
there is only one drawtext plugin for the given machine architecture,
but it is important for our own upstream distribution, so we can separate
the intel arch files from the arm arch files.

Screen for 64-Bit Octave on Linux rebuilt and tested.