builtin-commit uses commit_tree() from builtin-commit-tree since 6bb6b03 (builtin-commit: use commit_tree(), 2008-09-10), where the
same message is used.
Signed-off-by: Markus Heidelberg <markus.heidelberg@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>