win32: misc clean up a) t/doit.sh: clean up tmp file used in check_tar() b) fix the name of our cygwin tar package.
win32: misc clean up
a) t/doit.sh: clean up tmp file used in check_tar()
b) fix the name of our cygwin tar package.

bk: 3be6f37b4pnOs8NQNaXCIQrCp1TobA
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