Review Request 127347: Fix build with glibc >= 2.23 by using std namespace

[Heiko Becker]

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Review request for Calligra.


Repository: calligra


Description
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Otherwise I get "libs/widgets/KoUnitDoubleSpinBox.cpp:104:21: error:
'isnan' was not declared in this scope".


Diffs
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  libs/widgets/KoUnitDoubleSpinBox.cpp 37f5415966e91ed543b22e5f50d04d7039f43f7d 

Diff: https://git.reviewboard.kde.org/r/127347/diff/


Testing
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Builds.


Thanks,

Heiko Becker

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