msvcp90: add basic_ios<wchar_t> stubs (try 2)

[Daniel Lehman]

>> This should look like:
>> locale* __thiscall basic_ios_wchar_imbue(basic_ios_wchar *this, locale *ret)

try 2:
- fixes wchar_t version in .c and .spec as above
- also adds 'const locale *' that is going to be set
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