profile: Don't rely on bash syntax
profile: Don't rely on bash syntax

In Debian, we reuse flatpak.sh in /etc/X11/Xsession.d (which is sourced
by /bin/sh, normally dash) so that these environment variables become
part of the X11 session environment. We might also have
non-bash-compatible shells that read profile.d (I'm not sure).

Fixes #2594

Signed-off-by: Simon McVittie <smcv@debian.org>

Closes: #2597
Approved by: matthiasclasen

flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak