[libc++abi] Add builtins to dynamic library link

Otherwise libc++abi.so fails to link on arm with undefined references to
some __aeabi_ builtins.

Differential Revision: https://reviews.llvm.org/D96574

GitOrigin-RevId: 26a0aeba61717d096e5422deff02331d93d4b00a
1 file changed