Added entry to docs Makefile and Sphinx config to build PDF usinx XeTeX

We have a few unicode chars in the docs now. Plus this should be a good
change for future non-English builds of the docs.

doc/Makefile

@@ -139,6 +139,12 @@ latexpdfja: translations
 	$(MAKE) -C $(BUILDDIR)/latex all-pdf-ja
 	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
 
+xetexpdf: translations
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo "Running LaTeX files through xelatex..."
+	cd $(BUILDDIR)/latex; xelatex *.tex && xelatex *.tex; cd -
+	@echo "xelatex finished; the PDF files are in $(BUILDDIR)/latex."
+
 text: translations
 	$(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
 	@echo

doc/conf.py

@@ -235,6 +235,18 @@ latex_documents = [
 
 latex_logo = '_static/salt-logo.pdf'
 
+latex_elements = {
+    'inputenc': '',     # use XeTeX instead of the inputenc LaTeX package.
+    'utf8extra': '',
+    'preamble': '''
+
+\usepackage{fontspec}
+\setsansfont{DejaVu Sans}
+\setromanfont{DejaVu Serif}
+\setmonofont{DejaVu Sans Mono}
+''',
+}
+
 ### Linkcheck options
 linkcheck_ignore = [r'http://127.0.0.1',
                     r'http://salt:\d+',