Flössie 9c9ac0d589 Change -std=gnu++11 to -std=c++11 ...

I propose changing the default `-std=` compiler flag from the non-
standard `gnu++11` to `c++11`. Our code is fully C++11 compliant and
that should be reflected in the C++ standard we choose as default.

Furthermore there's an ambiguity as we make people use
`-DCMAKE_CXX_FLAGS="-std=c++11"` when this is already handled
(differently) in `CMakeLists.txt`. See the [pixls.us](https://discuss.pixls.us/t/rawtherapee-5-and-dcmake-cxx-flags/3145/3)
discussion. You also see it in `AboutThisBuild.txt`:

```
Build flags: -std=c++11 -Wno-deprecated-declarations -Wno-unused-result -std=gnu++11 -march=native -Werror=unused-label -fopenmp -Werror=unknown-pragmas -O3 -DNDEBUG
```

This commit changes `-std=gnu++11` to `-std=c++11` and builds fine
without `-DCMAKE_CXX_FLAGS="-std=c++11"`.

2017-02-14 20:57:57 +01:00

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