lt_dlhandle list iterator

[Gary V. Vaughan]

Currently, with lt_dlforeach, there is no way to implement search
algorithms across the opaque list of loaded modules.  This patch
defines a new function, lt_dlhandle_next(), modelled on lt_dlinfo_next.

Okay to commit?

Cheers,
        Gary.
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2001-01-05-lt_ldhandle_next.patch
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