This was not a clean build attempt (the log contains lines that say "Skipping completed"). Please "sudo port clean ghostscript" and try again.
If you still get the same error in the new log—that is:
strip: object: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_print_ghostscript/ghostscript/work/destroot/opt/local/bin/gsc malformed object (unknown load command 9)
then we'll need to look into your strip command and see why it cannot understand load command 9. Perhaps you've inadvertently replaced Xcode's strip command with a much older version.
