Get libtensorflow from LHCb mirror

Marco Clemencic requested to merge clemenci-master-patch-95425 into master

Some of the build machines we use for the nightlies are not able to connect to servers outside CERN, so the download step of libtensorflow fails if the build happens on those machines.

To circumvent the problem I'm maintaining a mirror of the libraries we need to download at build time. I added libtensorflow to the mirror and this MR modifies the configuration of GaudiTensorFlow to get the library from there.

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