Fix replacing the version number when it has a '/' in it, like

  SVN-group-chan_unistim-r88326M-/trunk


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@88327 65c4cc65-6c06-0410-ace0-fbb531ad65f3

doc/tex/Makefile

@@ -15,7 +15,7 @@ else
 	@echo "** located at asterisk.pdf.                ***"	
 	@echo "**********************************************"
 	@cp asterisk.tex asterisk.tex.orig
-	@sed -i -e 's/ASTERISKVERSION/$(ASTERISKVERSION)/' asterisk.tex
+	sed -i -e 's/ASTERISKVERSION/$(shell echo $(ASTERISKVERSION) | sed -e 's/\//\\\//g')/' asterisk.tex
 	@$(RUBBER) --pdf asterisk.tex
 	@mv asterisk.tex.orig asterisk.tex
 endif