Add release engineering note as unreproducible problem, suggesting a typical solution anyways.

stunnel/stunnel.spec

@@ -23,6 +23,8 @@
 ##  SUCH DAMAGE.
 ##
 
+#FIXME: ms This is unreproducible by hand installing.
+#FIXME: ms It might need manual installation to go around DESTDIR problem
 #   package information
 Name:         stunnel
 Summary:      SSL/TLS Tunneling Tool