On Windows, if the bk binary we are running is not the one from BK_BIN (as would be the case if we are bk subprocess run inside a built BK source tree) then respawn $BK_BIN/bk
On Windows, if the bk binary we are running is not the one from
BK_BIN (as would be the case if we are bk subprocess run inside
a built BK source tree) then respawn $BK_BIN/bk

This fixes a number of annoyances like the inability to run
citool when in a built bk tree.

bk: 561fb8139WCbHp5ScgRqEPLiw_1Afg
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper