[sr #110879] revert forcing/setting -std=gnu++11 by default (introduced in Autoconf 2.70)

[Zack Weinberg]

Update of sr#110879 (group autoconf):

                  Status:                    None => Duplicate              

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Follow-up Comment #2:

Effectively a duplicate of bug #110286 which I will treat as a priority item
for 2.73.  No changes are going to be made for 2.72, however.


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