Import obstack.* from gnulib

[Andreas Jaeger]

I've imported the current obstack versions into glibc.  The changes
should not effect the code but compilation:
- K&R support removed
- casts as lvalues removed

Ok to commit?

I'm appending the patch for reference,
Andreas

2004-01-24  Andreas Jaeger  <aj@suse.de>

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

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-- 
 Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj
  SuSE Linux AG, Maxfeldstr. 5, 90409 N?rnberg, Germany
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