Redirect stdout to stderr in -ideslave
Redirect stdout to stderr in -ideslave

This fixes "Print Grammar" in coqide, which uses a camlp5 function
that prints to stdout, interfering with the ide-slave
communication. Camlp5 should additionnally provide a way to print to a
formatter instead of directly using stdout...

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@13670 85f007b7-540e-0410-9357-904b9bb8a0f7

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