Help: Fix Sphinx extension with docutils < 0.11

In older versions of python docutils "error_reporting" was not in the
"utils" subpackage, so try the older location if the new one failed.

Alex

Utilities/Sphinx/cmake.py

@@ -14,7 +14,12 @@ import re
 
 from docutils.parsers.rst import Directive, directives
 from docutils.transforms import Transform
-from docutils.utils.error_reporting import SafeString, ErrorString
+try:
+    from docutils.utils.error_reporting import SafeString, ErrorString
+except ImportError:
+    # error_reporting was not in utils before version 0.11:
+    from docutils.error_reporting import SafeString, ErrorString
+
 from docutils import io, nodes
 
 from sphinx.directives import ObjectDescription