[Octave-bug-tracker] [bug #44965] configure.ac: Enable C++11 support if possible

[Mike Miller]

Follow-up Comment #2, bug #44965 (project octave):

Also worth noting that the test for C++11 is testing for quite a few language
features, and it doesn't fall back to allow for example an older version of
g++ that supports some but not all of the new library or language features.

My intent is to hopefully allow C++11 if the compiler is new enough, but
gracefully fall back to older compilers if not. And primarily to start
allowing use of new library features, not necessarily language features.

Maybe instead of having such a strict check for C++11, we should just add one
of the flags -std={gnu++11,c++11,gnu++0x,c++0x}, whichever one the compiler
accepts first, and then use other discrete feature tests for specific things
we may want to use. I may work up an alternate patch to that effect.

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