Previously "docbook2x-texi" failed to generate user-manual.texi and
gitman.texi files from .xml input files because "iconv" stopped at
"illegal input sequence" error. This was due to some UTF-8 octets in the
input .xml files. This patch adds option --encoding=UTF-8 for
"docbook2x-texi" to allow the building of .texi files complete.
Signed-off-by: Teemu Likonen <tlikonen@iki.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>