ports-mgmt/pkg: Fix stage-qa warning and sort PLIST

• Strip shared library and binary executable
• Sort PLIST
• Bump PORTREVISION for package change

> Running Q/A tests (stage-qa)

Warning: 'lib/libpkg.so.4' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}
Warning: 'sbin/pkg-static' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}
Warning: 'sbin/pkg' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}

PR: 290600
Approved by: bapt