[icu-support] Formatting with ISO 3 Letters symbol with ICU 3.8

[Artyom <art...@ya...>]

Hello,

New option was added in ICU 4.2 -- formatting currency with EStyles option
<http://icu-project.org/apiref/icu4c/classNumberFormat.html#1ff932f61eb4814182bf7f76daec125c>
Where I can provide: kIsoCurrencyStyle, but this is draft member function
and it is also not available in 3.8 and below.

According to DecimalFormatSymbols class there is an option to get ISO
code for currency, but I can't figure out how to create NumberFormat or
DecimalFormat instance that would format currency with ISO symbol instead
of national one.

Thanks.
  Artyom