Return library meta-info as String
An example output of af::info_string call looks like below
ArrayFire v3.0.0 (CUDA, 64-bit Mac OSX, build d8d4b38)
Platform: CUDA Toolkit 7, Driver: CUDA Driver Version: 7000
[0] GeForce GT 750M, 2048 MB, CUDA Compute 3.0
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HTML:
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