Calling QString::fromUcs4() for the single UCS-4 -encoded character is quite suboptimal
since the BOM detections and the resulting QString aren't really used;
all we need is to split the UCS-4 code point into the UCS-2 surrogate pair.
Change-Id: Ia5b68312909bf551cf2493d9e2752a7d7d837fb9
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>