warnings in libdl

[Joel Sherrill]

Hi

In looking at the last warnings run and some proposed
patches I have to eliminate some printf warnings, I
noticed that libdl/ has 26 unique warnings of the 183
in the last warning build.

I have attached a report that includes the BSP names
so someone can look at them.

This will make a dent in what remains.

Thanks.

--joel
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