Issue with libz version on Ubuntu 20.04

[christophe.pallier]

anatomist crashes at start up with the message:

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/home/cp983411/opt/brainvisa-4.6.1/lib/libz.so.1: version `ZLIB_1.2.9' not found 

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/home/cp983411/opt/brainvisa-4.6.1/lib/libz.so.1 -> libz.so.1.2.8

(Under Ubuntu 20.4, I have libz 1.2.11 in the standard libs : /usr/lib/x86_64-linux-gnu/libz.so.1.2.11)