They are deprecated in Qt 5. Use fromLatin1() and toLatin1() instead. In
Qt 5, these always do the same thing as their "Ascii" counterparts. The
same goes for Qt 4, provided QTextCodec::setCodecForCStrings has not
been set, which it hasn't.

Change-Id: I04edeb376762b6671eff8156094f0d5e2cb8e1ea
Reviewed-by: Kai Koehne <kai.koehne@digia.com>