[PATCH] Report dlsym, dlvsym lookup errors using dlerror [BZ #19509]

[Florian Weimer]

I'm not sure if this is the right fix.  I traced back the lack of error
reporting to the original addition of the RTLD_NEXT functionality.  I
don't know why it was omitted from it.

I could not find any callers of _dl_lookup_symbol_x which with skip_map
!= NULL and which are not related to RTLD_NEXT, so this change looks
pretty conservative to me.

Florian
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