Don't run the full latexmk process twice

Doc/Makefile

@@ -213,6 +213,10 @@ dist:
 	@echo "Building LaTeX (A4 paper)..."
 	rm -rf build/latex
 	$(MAKE) latex PAPER=a4
+	# remove zip & bz2 dependency on all-pdf,
+	# as otherwise the full latexmk process is run twice.
+	# ($$ is needed to escape the $; https://www.gnu.org/software/make/manual/make.html#Basics-of-Variable-References)
+	-sed -i 's/: all-$$(FMT)/:/' build/latex/Makefile
 	(cd build/latex; $(MAKE) clean && $(MAKE) --jobs=12 --output-sync LATEXMKOPTS='-quiet' all-pdf && $(MAKE) FMT=pdf zip bz2)
 	cp build/latex/docs-pdf.zip dist/python-$(DISTVERSION)-docs-pdf-a4.zip
 	cp build/latex/docs-pdf.tar.bz2 dist/python-$(DISTVERSION)-docs-pdf-a4.tar.bz2
@@ -222,6 +226,10 @@ dist:
 	@echo "Building LaTeX (US paper)..."
 	rm -rf build/latex
 	$(MAKE) latex PAPER=letter
+	# remove zip & bz2 dependency on all-pdf,
+	# as otherwise the full latexmk process is run twice.
+	# ($$ is needed to escape the $; https://www.gnu.org/software/make/manual/make.html#Basics-of-Variable-References)
+	-sed -i 's/: all-$$(FMT)/:/' build/latex/Makefile
 	(cd build/latex; $(MAKE) clean && $(MAKE) --jobs=12 --output-sync LATEXMKOPTS='-quiet' all-pdf && $(MAKE) FMT=pdf zip bz2)
 	cp build/latex/docs-pdf.zip dist/python-$(DISTVERSION)-docs-pdf-letter.zip
 	cp build/latex/docs-pdf.tar.bz2 dist/python-$(DISTVERSION)-docs-pdf-letter.tar.bz2