INFOPATH set in /etc/profile.d/guix.sh should end in ":" for Emacs's sake

> I installed Guix into my system, and I've been enjoying using it.

> However, I found that, after installing it, when I logged out and back

> in, and then started Emacs, Emacs could no longer see my system's info

> pages (including Emacs's own info pages). I found that the Emacs

> variable Info-directory-list only contained

> "/home/me/.config/guix/current/share/info", so it couldn't see the

> info pages in "/usr/local/share/info/" and "/usr/share/info/".

> According to the Info-directory-list docstring:

>

> If nil, meaning not yet initialized, Info uses the environment

> variable INFOPATH to initialize it, or ‘Info-default-directory-list’

> if there is no INFOPATH variable in the environment, or the

> concatenation of the two if INFOPATH ends with a ‘path-separator’.

>

> I found that INFOPATH is being set in /etc/profile.d/guix.sh, which does this:

>

> # Export INFOPATH so that the updated info pages can be found

> # and read by both /usr/bin/info and/or $GUIX_PROFILE/bin/info

> export INFOPATH="$_GUIX_PROFILE/share/info${INFOPATH:+:}$INFOPATH"

>

> Since it does not append a colon at the end, Emacs doesn't add the

> directories from Info-default-directory-list. I added a colon to the

> end and restarted Emacs, and it fixed the problem.

>

> So I'd suggest adding ":" to the end of INFOPATH in /etc/profile.d/guix.sh.