fix readir_r link name for netbsd

core/os/os_netbsd.odin

@@ -306,7 +306,7 @@ foreign libc {
 	@(link_name="fdopendir")        _unix_fdopendir     :: proc(fd: Handle) -> Dir ---
 	@(link_name="closedir")         _unix_closedir      :: proc(dirp: Dir) -> c.int ---
 	@(link_name="rewinddir")        _unix_rewinddir     :: proc(dirp: Dir) ---
-	@(link_name="readdir_r")        _unix_readdir_r     :: proc(dirp: Dir, entry: ^Dirent, result: ^^Dirent) -> c.int ---
+	@(link_name="__readdir_r30")    _unix_readdir_r     :: proc(dirp: Dir, entry: ^Dirent, result: ^^Dirent) -> c.int ---
 
 	@(link_name="malloc")           _unix_malloc        :: proc(size: c.size_t) -> rawptr ---
 	@(link_name="calloc")           _unix_calloc        :: proc(num, size: c.size_t) -> rawptr ---