remove line breaks in rubrics titles

build/pkgs/sphinx/patches/texinfo.patch

@@ -0,0 +1,21 @@
+Make sure that titles of rubrics do not contain line breaks
+
+diff -ru a/sphinx/writers/texinfo b/sphinx/writers/texinfo
+--- a/sphinx/writers/texinfo.py	2016-06-11 12:57:23.000000000 +0200
++++ b/sphinx/writers/texinfo.py	2016-10-23 21:10:55.198715409 +0200
+@@ -615,6 +615,7 @@
+         self.body.append('\n\n')
+
+     def visit_rubric(self, node):
++        self.escape_newlines += 1
+         if len(node.children) == 1 and node.children[0].astext() in \
+                 ('Footnotes', _('Footnotes')):
+             raise nodes.SkipNode
+@@ -626,6 +627,7 @@
+
+     def depart_rubric(self, node):
+         self.body.append('\n\n')
++        self.escape_newlines -= 1        
+
+     def visit_subtitle(self, node):
+         self.body.append('\n\n@noindent\n')