Charset conversion fix (partial) when using ARMhf Linaro toolchains

Currently supported toolchains:

Linaro 2013.04
Linaro 2013.05
Linaro 2013.06
Linaro 2013.07
Linaro 2013.08

This is partial fix. Other part involves actual fonts and
their integration in XBMC itself.

Basically, subtitle decoding works, doesn't crash :)