build: Add missing new line to replaced python shebang line. (Fix bug #9909)

build: Add missing new line to replaced python shebang line. (Fix bug #9909)

When configuring with a non-standard python specified in
the PYTHON environment variable, the shebang lines in various
python tools like samba-tool and samba_dnsupdate get replaced.

This replace line for the shebang was missing a newline
which joined the shebang line with the following line,
rendereing those scripts with a nonempty second line unusuable,
for example samba_dnsupdate.

This patch fixes this bug which is bug #9909 on bugzilla.

Pair-Programmed-With: Karolin Seeger <kseeger@samba.org>

Signed-off-by: Michael Adam <obnox@samba.org>
Signed-off-by: Karolin Seeger <kseeger@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Michael Adam <obnox@samba.org>
Autobuild-Date(master): Wed May 29 13:21:51 CEST 2013 on sn-devel-104
(cherry picked from commit 3f24d694e7e2190d30a17bc13a79a36b49711531)