[PATCH] Fix up install_with_python.sh to be more portable

[Andrew Bartlett]

As systems without python are also likely to be old or non-GNU, we need
to avoid assuming bash, and try harder to use the right python and
python libs during the build.

Attached are 4 patches towards that, please review (and or push). 

Andrew Bartlett
-- 
Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org

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