Win32: if we make coqide console-free, then stderr/stdout/sdtin shouldn't be used

 This is an adaptation of commit r13751 of branch 8.3

 Even if coqide.exe keeps its console by default for the moment,
 we try to allow turning it off (for instance via the mkwinapp tool) :
 for that we need to be cautious about the use of functions
 like prerr_endline. Since stderr doesn't exists in this settings,
 such functions trigger a Sys_error "bad file descriptor".
 This patch protects many access to std** by a (try ... with _ ->()).

 Nota: with camlp5 < 6.02.1, Print Grammar was also generating
 such a Sys_error.

 TODO: we should try to figure a way of displaying messages (both
  debug and early/late error message). A log file ? A popup ?
  diplay in the response buffer ?

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14040 85f007b7-540e-0410-9357-904b9bb8a0f7

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