Currently on I see link failures like the following:
```bash
./configure
<snip>
checking for libsodium with IETF chacha20 variants... yes
<snip>
ar libccan.a
ld ccan/ccan/cdump/tools/cdump-enumstr
ld: library 'sodium' not found
clang: error: linker command failed with exit code 1 (use -v to see invocation)
```
The configure check passes under Clang here.
Changelog-Fixed: build: fix linking against libsodium on macOS.
305c377985