t9001: use older Getopt::Long boolean prefix '--no' rather than '--no-'

t9001: use older Getopt::Long boolean prefix '--no' rather than '--no-'

The '--no-thread' option is a Getopt::Long boolean option. The '--no-'
prefix (as in --no-thread) for boolean options is not supported in
Getopt::Long version 2.32 which was released with Perl 5.8.0. This version
only supports '--no' as in '--nothread'.  More recent versions of
Getopt::Long, such as version 2.34, support either prefix. So use the older
form in the tests.

Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
Signed-off-by: Junio C Hamano <gitster@pobox.com>