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045c0609b5
`TensorRandom` currently relies on BSD `random()`, which is not always available. The [linux manpage](https://man7.org/linux/man-pages/man3/srandom.3.html) gives the glibc condition: ``` _XOPEN_SOURCE >= 500 || /* Glibc since 2.19: */ _DEFAULT_SOURCE || /* Glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE ``` In particular, this was failing to compile for MinGW via msys2. If not available, we fall back to using `rand()`.