Get libtensorflow from LHCb mirror

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.

added all-slots label

changed milestone to %Gauss v55r4

added Build enhancement labels

Note that his change is not strictly necessary as one could change the URL via CMake command line flag or nightly configuration. It just makes the configuration simpler.

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requested review from @landerli

approved this merge request

Ciao @gcorti, I am fine with this proposal. But let me mention that GaudiTensorFlow is dismissed in Lamarr and I am not aware of any other user in LHCb. Furthermore, because of the problems with multithreading I do not believe it will play any role with the software for the upgrade. As long as it does not require too much effort we can keep it alive but today there are alternative solutions (e.g. ONNX) we should consider instead.

resolved all threads

mentioned in issue #45 (closed)

merged

mentioned in commit dfce7eca

removed review request for @landerli

removed all-slots label