depfixer: fix darwin regression when install rpaths are used

Fixes regression in commit 78e9009ff9d36925e04f329f9082841002ddd848.

new_rpath is only set when install_rpath appears in meson.build.

Before this commit, we treated new_rpath as a single string to pass to
-add_rpath. This worked as long as new_rpath had a single rpath in it,
though for ELF we explicitly supported multiple rpaths separated with
":" (as binutils ld is quite happy with that too).

install_name_tool does not support paths with colons in it:
```
21:12 <awilfox> Load command 19          cmd LC_RPATH      cmdsize 40         path /bar:/baz:/eli:/ldap (offset 12)
21:12 <awilfox> Load command 20          cmd LC_RPATH      cmdsize 24         path /foo (offset 12)
21:14 <awilfox> so the result is: do not use colons
```

After commit 78e9009ff9d36925e04f329f9082841002ddd848, we simply ended
up with one load command for LC_RPATH per char in new_rpath, which was
wrong in every possible case.

What we actually need to do is pass every distinct rpath as a separate
`-add_rpath` argument, so we split it on the colons instead. We do the
same splitting to ensure proper diff'ability for ELF anyways...

Fixes #13355

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