Remove libTensorFlow forced linking.

[pschuh]

I seem to be able to run swift test.swift without these linked in, so I think that they're unnecessary. Also, fixed the "-ltensorflow" problem in a different way. This may break some things I'm not able to test on mac, but I think we should fix-forward that.

[pschuh]

For reference, this is the test I ran (along with the normal tests)

import TensorFlow
import Python

print(Tensor<Float>(3.0))

print(Python.import("numpy"))

[pschuh]

@swift-ci please test tensorflow

[dan-zheng]

LGTM!

This may break some things I'm not able to test on mac, but I think we should fix-forward that.

I wonder what breakages do you anticipate on macOS? I believe changes in lib/Driver/UnixToolChains.cpp don't affect macOS, which uses the related lib/Driver/DarwinToolChains.cpp file.

[pschuh]

Hi Dan,
The comment suggests that this was added to solve some xcode problem on mac. I expect that this might be somehow automatically solved by time, but the original issues might pop up again.

[dan-zheng]

Notes from @pschuh for reference:

• The link "tensorflow" added to stdlib/public/CTensorFlow/module.modulemap should eliminate the need for Arguments.push_back("-ltensorflow"); here.
• -lswiftPython and -lswiftTensorFlow may be fixed by specifying the -module-link-name flag.

[pschuh]

@swift-ci please test tensorflow gpu

[bgogul]

Thanks, @pschuh !