Remove the legacy bin group/user from the installed files

--- a/Makefile.in
+++ b/Makefile.in
@@ -104,11 +104,11 @@
 
 installthis:
 	-mkdir -p $(DESTDIR)$(BINDIR)
-	$(INSTALL) -m 555 -o bin -g bin thttpd $(DESTDIR)$(BINDIR)
+	$(INSTALL) -m 755 thttpd $(DESTDIR)$(BINDIR)
 
 install-man:
 	-mkdir -p $(DESTDIR)$(MANDIR)/man8
-	$(INSTALL) -m 444 -o bin -g bin thttpd.8 $(DESTDIR)$(MANDIR)/man8
+	$(INSTALL) -m 644 thttpd.8 $(DESTDIR)$(MANDIR)/man8
 
 installsubdirs:
 	for i in $(SUBDIRS) ; do ( \