vi: allow backward search to specify line address

It should be possible to use a backward search as a line address
in colon commands.

function                                             old     new   delta
colon                                               3661    3701     +40
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 40/0)               Total: 40 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed