fs/unicode patches for v5.9

This includes 3 patches for the unicode system for inclusion into
Linux v5.9:

  - A patch by Ricardo CaƱuelo converting the unicode tests to kunit.

  - A patch from Gabriel exporting in sysfs the most recent utf-8
    version available.

  - A patch from Gabriel fixing the build of the kunit part as a module.

  - A patch from Alexander updating documentation web links.
unicode: Replace HTTP links with HTTPS ones

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
            If both the HTTP and HTTPS versions
            return 200 OK and serve the same content:
              Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
[fix summary line]
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
2 files changed