Made the debugger work again:

- call to open_process_full from Envars.camlp4lib was apparently
  disturbing stdin/stdout/stderr and precipitating coqtop.byte death
  in ocamldebug; renounced to add camlp4 to the ml path (why was it useful?)
  which was the reason for calling camlp4lib (seems like camlp4lib
  is now useless),
- Envars was needing str.cma which was missing when calling printers.cma;
  renounced to use str.cma since its only use was for an elementary 
  split function.


git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@11734 85f007b7-540e-0410-9357-904b9bb8a0f7

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