* etc/guix-install.sh (sys_create_init_profile): Set PATH and INFOPATH
even when $_GUIX_PROFILE does not exist.
After initial installation on a foreign distro, the guix pull profile
won't be present in path. This means that the first guix pull won't take
effect until the shell is restarted.
~/.guix-profile cannot be pre-loaded like this as the relevant paths are
stored in ~/.guix-profile/etc/profile, which simply won't exist.
However, guix package will output a relevant hint that instructs the
user to reload the profile, so this isn't a problem.
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