We do not need a C++ GNU dialect

1cf7ab61a71d4b7295942ff5c855896e60c15081 "use -std=gnu++0x rather than
-std=c++0x" appears to have started this, but the only rationale it gives is
that it keeps things in sync with GCC's default behavior when no -std= is given.
But it apparently works fine to build with a -std=c++... standard dialect.

This allows to get rid of the check introduced with
50cd28e5728b6a64c1e605567540739ea6ef42ca "Ensure configuration that defines
math_errhandling in <cmath>".

(It kept bothering me to say "I observe this-and-this with -std=c++2a" when what
configure.ac made me actually use was -std=gnu++2a.  And truthfully saying
"-std=gnu++2a" would have been a distraction, as what is relevant for such an
observation is most likely the "2a" and not the "gnu" part.)

Change-Id: I7c213a702ffb7df6f4c2c4a421008e30e2712a51
Reviewed-on: https://gerrit.libreoffice.org/81176
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

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