[CMake] detecting if c++11 available

[Theodore Papadopoulo]

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Nowadays, asking for c++-11 is probably too coarse as implementations
are usually uncomplete. So you have a stdc++-11 switch and still
missing some features on which you rely.

Another technique is to test features instead of the whole standard,
that would be more robust...

I did something like that to get a cmake build of a library used to
build with automake/autoconf (which have such a facility). It might
not be very complicated to extend to new features....

	Theo.
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