add ERR_asprintf_error_data, A tool to be used to get rid of the far too

frequent construct of 30 lines of pointer and strlcat insanity followed
by an ERR_add_error_data. I will sweep through here like a chubby mongol
horde in the next few days pillaging crappy ERR_add_error_data's.
Oh and while we're at it fix the nasty vdata function to use something less
hard on the eyes.
ok jsing@

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