[Patch] Another fix for cycle detection

[Jeff Law <law at redhat dot com>]

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The "seen" counter in the cycle detection code is defined as a char
array.  As a result the counter can trivially overflow during cycle
detection when presented with 127 or more libraries in a pathological
ordering.

While it seems somewhat absurd, I expect we're not far from the point
where we're going to see in excess of 256 DSOs being used.  So simply
changing to an unsigned char isn't really sufficient.

It also seems that using a 32 or 64 bit type would be horribly
excessive.  So, an "unsigned short" seems to be the right compromise
to me.

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