Remove old build artifacts from repo

The releases/ subdirectory contains latex build artifacts. The idea was
to use it when creating a changebar version of the document, but it is a
little difficult to manage as part of the repo. The old document is
always available in a previous git tag anyway, so the build products can
be regenerated. So, drop the releases directory entirely.

Signed-off-by: Grant Likely <[email protected]>

Author: glikely

Makefile

@@ -5,7 +5,6 @@
 SPHINXOPTS    =
 SPHINXBUILD   = sphinx-build
 PAPER         =
-RELEASEDIR    = release
 BUILDDIR      = build
 LATEXDIFF     = latexdiff
 
@@ -145,7 +144,7 @@ latex:
 latexdiff:
 	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
 	@echo "Generating LaTeX changebars..."
-	$(LATEXDIFF) --type=CULINECHBAR $(RELEASEDIR)/latex/devicetree-specification.tex $(BUILDDIR)/latex/devicetree-specification.tex > $(BUILDDIR)/latex/devicetree-specification-changebars.tex
+	$(LATEXDIFF) --type=CULINECHBAR $(BUILDDIR)/latex-previous/devicetree-specification.tex $(BUILDDIR)/latex/devicetree-specification.tex > $(BUILDDIR)/latex/devicetree-specification-changebars.tex
 	@echo "Running LaTeX files through pdflatex..."
 	$(MAKE) -C $(BUILDDIR)/latex all-pdf
 	@echo