fix make clean

Makefile

@@ -23,7 +23,9 @@ all: $(BOOK).pdf
 	@latexmk -jobname=$(BOOK) -shell-escape -pdf main.tex
 
 clean:
-	rm -fr *.aux *.sls *.slo *.slg *.toc *.acn *.log *.out *.idx *.ist *.glo *.glg *.gls *.acr *.alg \
+	rm -fr *.aux *.sls *.slo *.slg *.toc *.acn *.log *.out *.idx *.ist \
+	*glo \
+	*.glg *.gls *.acr *.alg \
 	*.ilg \
 	*.ind \
 	*.ptc \