````
This strips some unused dylibs from bitcoin-qt.
From man ld:
Remove dylibs that are unreachable by the entry point or exported
symbols.
That is, suppresses the generation of load command commands for dylibs
which supplied no symbols during the link. This option should not be
used when linking against a dylib which is required at runtime for
some indirect reason such as the dylib has an important initializer.
```
Backport of core PR17676.
Only the commit ba0cad2
(https://github.com/bitcoin/bitcoin/pull/17676/commits/ba0cad2702e01860d3539f170343d8d9f9c5b75a)
is backported as the other is already covered by D3034.