Fix conditions on checking versions of dprintf (bug 13775)

[Andreas Jaeger]

On 05/02/2012 09:33 PM, Joseph S. Myers wrote:
> Bug 13775 was an issue with inconsistency in the conditions applied to
> declarations of dprintf and vdprintf in different headers.  This was
> fixed for the stdio-ldbl.h declarations - but not for the checking
> versions of the functions.  I propose this patch to move the checking
> versions also from __USE_GNU to __USE_XOPEN2K8.  Tested x86_64.

thanks, this is ok,

Andreas
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