[committed] Don't share target config.cache on mainline

[Andreas Jaeger]

I retested trunk on two different SMP machines and now both fail to
build gcc with a parallel build.  This is much worse than before where
it only failed occasionally - but not three times out of three it
failed.:-(

Andreas
-- 
 Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj
  SuSE Linux AG, Maxfeldstr. 5, 90409 Nürnberg, Germany
   GPG fingerprint = 93A3 365E CE47 B889 DF7F  FED1 389A 563C C272 A126
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