[RTEMS Project] #3311: Update waf.py for Sphinx 1.7 compatibility

[RTEMS trac]

#3311: Update waf.py for Sphinx 1.7 compatibility
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 Reporter:  Richard Campbell  |       Owner:  Chris Johns
     Type:  defect            |      Status:  reopened
 Priority:  normal            |   Milestone:
Component:  doc               |     Version:
 Severity:  normal            |  Resolution:
 Keywords:                    |  Blocked By:
 Blocking:                    |
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Comment (by Richard Campbell):

 Deleted import of Sphinx
 Ask Sphinx for its version with a single call.
 Check both stdout and stderr for version string.
 Wrap a single conversion line as was done in previous code.

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Ticket URL: <http://devel.rtems.org/ticket/3311#comment:6>
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