New MSVC 2015 build failure

[Luke Benes]

Before
https://cgit.freedesktop.org/libreoffice/core/commit/?id=0f03a801318501a4904dbe7c1d09d0b9dd1cb852

I was able to successfully compile with MSVC 2015, but now I'm getting:

C:/core/chart2/source/controller/uitest/uiobject.cxx(149): error C2039: 'inserter': is not a member of 'std'
C:/PROGRA~2/MICROS~1.0/VC//include\unordered_set(13): note: see declaration of 'std'
C:/core/chart2/source/controller/uitest/uiobject.cxx(149): error C3861: 'inserter': identifier not found
C:/core/solenv/gbuild/LinkTarget.mk:189: recipe for target 'C:/core/workdir/CxxObject/chart2/source/controller/uitest/uiobject.o' failed
make[1]: *** [C:/core/workdir/CxxObject/chart2/source/controller/uitest/uiobject.o] Error 2
make[1]: *** Waiting for unfinished jobs....
Makefile:262: recipe for target 'build' failed
make: *** [build] Error 2
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