The properties:
 System.setProperty("awt.useSystemAAFontSettings", "on");
 System.setProperty("swing.aatext", "true");
actually works on Linux (where the hint helps X11 to enable antialiased
rendering) but makes things worse on Windows where the outcome is exactly
the opposite (anti-alias is disabled).
Previously those settings had no effect because they were executed
*after* the initialization of the graphics. This is no more true
after the merge of arduino#5578, that moved the graphics initialization
after commmand line parsing and consequently revealed the weird
behaviour on windows.
Fix arduino#5750