- fix the root cause behind infinite loop during ntpd install

- fix the root cause behind infinite loop during ntpd install

On Fri, 30 Nov 2012, Jeffrey Johnson wrote:
[...]
> Yes: the iterator loop index on dependency sets is global.
>
> Which means that if something decrements the iterator index
> lower down, then the high level will continuously repeat.

And this exactly happened in lib/rpmal.c:rpmalAllSatisfiesDepend()
for 'provides' set because ntpd provided 'ntp' twice in different
manespaces.