[FreeBSD] extra steps required to successfully build #1592
Description
The README lists x86_64-unknown-freebsd as a fully supported and tested target, but the tests are not currently being run in CI.
As I mentioned in rust-lang/rust#134863 it's possible to get cranelift to build without any hiccups by setting the LD_STATIC_TLS_EXTRA environment variable to a non-zero value. A closed issue on rust-lang/rust#140092 mentions Polars having the same issue on FreeBSD 14.2 and 1024 being the magic number - though that still failed when building cranelift on my machine. So I did what any reasonable person would do and quadrupled the value to have it successfully build.
Perhaps this could be used to re-enable CI checks, as well as be either documented or applied in the y.sh script (under a conditional check for FreeBSD in uname -o)?