Fix python-cmd.sh generation and cleanup
Fix python-cmd.sh generation and cleanup

Clean up cmd/python-cmd.sh, add config/configure.inc as a dependency,
and invoke ./configure, not config/configure (which would fail).

This was rarely observed because ./configure would normally be invoked
by other dependencies first.

Signed-off-by: Rob Browning <1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org>
Tested-by: Rob Browning <1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org>

gevaerts/bup,gevaerts/bup,ToxicFrog/bup,ToxicFrog/bup,tjanez/bup,gevaerts/bup,gevaerts/bup,ToxicFrog/bup,gevaerts/bup,tjanez/bup,tjanez/bup,tjanez/bup,tjanez/bup,ToxicFrog/bup,tjanez/bup,ToxicFrog/bup