Dont use a custom LaTeX builder

Since we no longer need Cyrillic text, we dont need a custom builder.
And apparently sphinx breaks with a custom latex builder. See https://github.com/sphinx-doc/sphinx/issues/8936

manual/build.py

@@ -42,7 +42,7 @@ def build_manual(language, base):
     sb = partial(sphinx_build, language, base)
     onlinedir = sb(t='online')
     epubdir = sb('myepub', 'epub')
-    latexdir = sb('mylatex', 'latex')
+    latexdir = sb('latex', 'latex')
     pwd = os.getcwd()
     os.chdir(latexdir)
 

manual/custom.py

@@ -11,7 +11,6 @@ from sphinx.util.logging import getLogger
 
 from calibre.linux import cli_index_strings, entry_points
 from epub import EPUBHelpBuilder
-from latex import LaTeXHelpBuilder
 
 
 def info(*a):
@@ -356,7 +355,6 @@ def setup(app):
     generate_docs(app.config.language)
     app.add_css_file('custom.css')
     app.add_builder(EPUBHelpBuilder)
-    app.add_builder(LaTeXHelpBuilder)
     app.connect('source-read', source_read_handler)
     app.connect('html-page-context', add_html_context)
     app.connect('build-finished', finished)

manual/latex.py

@@ -1,30 +0,0 @@
-#!/usr/bin/env python
-# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-
-
-__license__   = 'GPL v3'
-__copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
-__docformat__ = 'restructuredtext en'
-
-from sphinx.builders.latex import LaTeXBuilder
-from sphinx.util.logging import getLogger
-from sphinx.writers.latex import LaTeXTranslator
-
-
-def info(*a):
-    getLogger(__name__).info(*a)
-
-
-class FixedLaTeXTranslator(LaTeXTranslator):
-    # see https://github.com/sphinx-doc/sphinx/issues/8936
-
-    def visit_substitution_definition(self, node):
-        pass
-
-    def depart_substitution_definition(self, node):
-        pass
-
-
-class LaTeXHelpBuilder(LaTeXBuilder):
-    name = 'mylatex'
-    default_translator_class = FixedLaTeXTranslator