After I discovered that UTF-16-LE-BOM test was buggy, I decided that
better tests are required. Possibly the best option here is to compare
git results against hardcoded ground truth.
The new tests also cover more interesting chars where (ANSI != UTF-8).
Signed-off-by: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com> Reviewed-by: Torsten Bögershausen <tboegi@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>