systrace: convert input strings using local codepage.

The message handler uses C strings so no information about encoding is
present. Since an 8 bit encoding is used convert them to make the
systrace window show non-ASCII characters properly.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29206 a1c6a512-1295-4272-9138-f99709370657
1 file changed