[Development] Shall we turn on /utf-8 compiler option when build qt for Windows?

[Liang Jian]

    Start from qt-5.8 I can't build qt anymore under Windows(simplified
chinese locale). Since there is a file
src/plugins/generic/tuiotouch/qtuiohandler.cpp which contain non-latin-1
character, msvc2015 assume the source code's character set should be CP936
which make the complilation fail.
    I can only build qt by comment the line which contain the specical
character in src/plugins/generic/tuiotouch/qtuiohandler.cpp.
    But if I turn on -developer-build in configuration step, thing will get
worse than before, since -developer-build means treat warning as error, and
again I can't build qt anymore since there are other files contain
non-latin1 character (such as qstring.cpp), the build will fail due to the
character set warning.
    I am working on a Windows 10 x64 simplifed chinese machine, msvc2015
update3
    For more detail please refer to
https://bugreports.qt.io/browse/QTBUG-58161

    As a workaround, I have to modify the file
qtbase/mkspecs/common/msvc-desktop.conf
QMAKE_CFLAGS            = -nologo -Zc:wchar_t /utf-8
    After I add /utf-8 compiler option the build goes well.
    Shall we turn on this compiler option by default?
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