UKRunner: GNUstep: raise the runloop minimum run time to 1ms to fix freezing in Valgrind.

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/UnitKit@10486 7b3f36aa-e6db-49c1-8b4c-66eac1997e64