avoid rm -rf in root/etc altogether to avoid any more accidents during install

related to users not following the installation guide.


git-svn-id: http://root.cern.ch/svn/root/trunk@19560 27541ba8-7e3a-0410-8455-c3a389f83636

Makefile

@@ -843,7 +843,7 @@ install: all
 	   $(INSTALLDATA) man/man1/*            $(DESTDIR)$(MANDIR); \
 	   find $(DESTDIR)$(MANDIR) -name CVS -exec rm -rf {} \; >/dev/null 2>&1; \
 	   echo "Installing config files in $(DESTDIR)$(ETCDIR)"; \
-	   rm -rf                               $(DESTDIR)$(ETCDIR); \
+	   rm -f                                $(DESTDIR)$(ETCDIR)/system.rootmap; \
 	   $(INSTALLDIR)                        $(DESTDIR)$(ETCDIR); \
 	   $(INSTALLDATA) etc/*                 $(DESTDIR)$(ETCDIR); \
 	   find $(DESTDIR)$(ETCDIR) -name CVS -exec rm -rf {} \; >/dev/null 2>&1; \