Auto merge of #31735 - aliclark:freebsd-link-defs, r=alexcrichton

The FreeBSD linker config is missing some options present in the other BSD configs.

This seems accidental, with other BSDs having the flags added in platform-specific commits, or with the flags present from day 1.

Some other BSD commits for reference:
https://github.com/aliclark/rust/commit/fcb30a0b67b1bd4acbc3422ff74fac5d031ae1ae#diff-db69d903e469b7769aefaa31786fc2c4R1
https://github.com/aliclark/rust/commit/0b7c4f57f6ba59dabe4db2808fe45e8bd8bbce22#diff-1c7b74536ce0291d1f89953035f26a71R1

https://github.com/aliclark/rust/commit/cfd2a5cfa148b1c927571cc2e9f06e242831b696