Import obstack.* from gnulib

[Ulrich Drepper]

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Andreas Jaeger wrote:

> 	* malloc/obstack.h: Import gnulib version.
> 	* malloc/obstack.c: Likewise.

I've checked in the patch with one additional change.

- -- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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