[Pas2js] Small typo in fpmake

[Alfred]

https://svn.freepascal.org/svn/projects/pas2js/trunk/fpmake.pp

Contains:
uses {$ifdef unix}cthreads{$endif},sysutils,fpmkunit;

Should be:
uses {$ifdef unix}cthreads,{$endif}sysutils,fpmkunit;

This typo prevents building on non-Unix.

Thanks.
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