venv: append `--without-kmod` to LTTng-tools's configuration
venv: append `--without-kmod` to LTTng-tools's configuration

What used to be `--disable-kmod` is now (recent versions of LTTng)
`--without-kmod`, so use both.

Signed-off-by: Philippe Proulx <2096628897b40c93960fdd9e24c9c883a54d4fe9@gmail.com>

eepp/vlttng