OLEAUT32: Single|Double->BSTR conversion must always use locale (with tests)

[Alex Villací­s Lasso]

Finally, I made a test that shows that native oleaut32 produces 
different strings for different locales with the same floating point 
number, even in the absence of the LOCALE_USE_NLS flag. The floating 
point 0.5 is shown to be converted to "0.5" in en_US locale and to "0,5" 
in es_ES locale. The test, and the patch that fixes the issue are in 
separate files. Hope it doesn't matter.

Alex Villacís Lasso

Changelog:
* Make Single|Double->BSTR conversion use the specified locale for the 
decimal point even without the LOCALE_USE_NLS flag. Test supplied.
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