os-release: Quote variables as documented in the manual

Variables must be quoted if they contain non-alphanumeric characters.

Warner noted in the review that the lack of quoting causing problems
he

os-release: Quote variables as documented in the manual

Variables must be quoted if they contain non-alphanumeric characters.

Warner noted in the review that the lack of quoting causing problems
here is rather an edge case. I believe that it's worth adding the quotes
here anyway because this is what the specification says and there is no
good reason not to follow it.

Reviewed by: imp
Approved by: imp (src)
MFC after: 7 days

(cherry picked from commit 169e06fa7852810f4ced2cce7a3c14ca9443bf39)

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Add missing rcvar name for os-release.

Create /etc/os-release file.

Each boot, regenerate /var/run/os-release based on the currently running
system. Create a /etc/os-release symlink pointing to this file (so that this
doesn't create a ne

Create /etc/os-release file.

Each boot, regenerate /var/run/os-release based on the currently running
system. Create a /etc/os-release symlink pointing to this file (so that this
doesn't create a new reason /etc can not be mounted read-only).

This is compatible with what other systems do and is what the sysutil/os-release
port attempted to do, but in an incomplete way. Linux, Solaris and DragonFly all
implement this natively as well. The complete standard can be found at
https://www.freedesktop.org/software/systemd/man/os-release.html

Moving this to the base solves both the non-standard location problem with the
port, as well as the lack of update of this file on system update.

Bump __FreeBSD_version to 1300060

PR: 238953
Differential Revision: https://reviews.freebsd.org/D22271

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