[PATCH] Add writeFileWithSystemEncoding to LibLLVMSupport

[Rafael Espíndola]

> IIRC my conclusion was that all GNU programs running on Windows uses the
> current codepage, which would mean that binutils is also on this category.
> But I will re-investigate this matter to be sure.

:-(

Thanks for checking.  Please add a comment close to the enum /function
declaration saying which tools need the native code page. If you
motivated, please open a bug with binutils asking them to support
UTF8, or at least UTF16.

Thanks,
Rafael