Work with x86_64 in Debug

Current setting build binary for i386 in Debug, so I updated it for not
only i386 also x86_64.

The result of `lipo -info /path/to/TerminalCopyOnSelect` changed from:

    Non-fat file: /path/to/TerminalCopyOnSelect is architecture: i386

to:

    Architectures in the fat file: /path/to/TerminalCopyOnSelect are: x86_64 i386