use explicit path for python

[Michael Vogt]

Antony wrote (in #16087):
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The problem is that it's #! line has changed from /usr/bin/env python to
/usr/bin/env python2.4. I (as Python release manager) have a bunch of other
python versions installed in /usr/local/bin (but not a binary called 'python')

As a kinda important system tool, update-manager should really use an explicit
path to /usr/bin/python2.4

Also, gnome-app-install (part of gnome-app-install) needs the same love.
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[Michael Vogt (mvo)]

will be part of the next upload

[Michael Vogt (mvo)]

Fixed with the upload of:
 gnome-app-install_0+20051004_source