[PATCH] Implement error_print_progname

[Carmelo AMOROSO]

Will Newton wrote:
> Further to the changes to error.c to fix bug #1869 it would be nice if
> uClibc supported error_print_progname. The attached patch aims to do
> that.
>   
Hi Will,
since a long time nobody further replied to this topic.
I was convinced (likely erroneously) about its goodness,
so committed in rev 21797.

Cheers,
Carmelo
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