buildtools/wafsamba: re-write shebang for delivered python scripts

Noel Powerrequested to merge
samba-team/devel/samba:npower_shebang into master

Can't see how the orig code would have worked though a) task.env["PYTHON"] is a list b) task.env["PYTHON_SPECIFIED"] can (and is in our case false) looks like it would only be true for python2 but in anycase no harm we always rewrite the shebang

Signed-off-by: Noel Power noel.power@suse.com

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