Don't do workarounds for broken shells. Busybox is about to grow a shell that

Don't do workarounds for broken shells.  Busybox is about to grow a shell that
we can run our own testsuite under, and I want it to handle the full range of
strange and peverted behavior you can find in real world shell scripts.
In the meantime, I'll just say #!/bin/bash in places that may care.