t3032-*.sh: Pass the -b (--binary) option to sed on cygwin

t3032-*.sh: Pass the -b (--binary) option to sed on cygwin

The test using the conflict_hunks helper function (test 9) fails
on cygwin, since sed (by default) throws away the CR from CRLF
line endings. This behaviour is undesirable, since the validation
code expects the CRLF line-ending to be present. In order to fix
the problem we pass the -b (--binary) option to sed, using the
SED_OPTIONS variable. We use the SED_STRIPS_CR prerequisite in the
conditional initialisation of SED_OPTIONS.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Acked-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>