build: pass -dead_strip_dylibs to ld on macOS
build: pass -dead_strip_dylibs to ld on macOS

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.


Former-commit-id: e37e49fcd6070e5fa81fbab5e8ccfaff2b996654
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin