Stub libraries for FreeBSD contain versioned symbols that should only be unversioned

```asm
.balign 8
.globl _secure_path
.type _secure_path, %function
_secure_path: .quad 0
.balign 8
.globl _secure_path_FBSD_1_7
.type _secure_path_FBSD_1_7, %function
.symver _secure_path_FBSD_1_7, _secure_path@@FBSD_1.7, remove
_secure_path_FBSD_1_7: .quad 0
```

This is clearly wrong; only the unversioned symbol should be written.