Fix tst_qtendian autotest build for WEC7.

MSVC2008 compiler fo ARM targets fail to compile qToUnaligned when
using sizeof(T) inside memcpy fynction. The compiler fails at least
when the code is reached through the following macros and templates:
    -> tst_QtEndian::toLittleEndian
        -> qToLittleEndian(T src, uchar *dest)
            -> qToUnaligned(const T src, uchar *dest)

The above sequence produces internal compiler error with
MSVC2008/ARM builds when called from tst_endian.

As a workaround sizeof(T) is called outside memcpy function.

Change-Id: Ib4d382c2cebecb6e54bb99fc8fad72db93825fcd
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>