release.sh: pkg_install should be installed 1st
release.sh: pkg_install should be installed 1st

pkgin now depends on pkg_install. If pkg_install appears after pkgin
in PREINSTALLED_PACKAGES, there will be an error because pkg_install
was installed as a dependency for pkgin.

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi