borgbackup: Update to version 1.2.0

borgbackup: Update to version 1.2.0

- Update from 1.1.17 to 1.2.0
- Update of rootfile
- v2 version has x86_64 replaced by xxxMACHINExxx in the rootfile
- borgbackup now requires the python module pkgconfig, installed as a set with this patch
- Changelog
	Compatibility notes:
	    dropped support / testing for older Pythons, minimum requirement is 3.8. In
             case your OS does not provide Python >= 3.8, consider using our binary,
             which does not need an external Python interpreter. Or continue using
             borg 1.1.x, which is still supported.
	    freeing repository space only happens when “borg compact” is invoked.
	    mount: the default for --numeric-ids is False now (same as borg extract)
	    borg create --noatime is deprecated. Not storing atime is the default
             behaviour now (use --atime if you want to store the atime).
	    list: corrected mix-up of “isomtime” and “mtime” formats. Previously,
             “isomtime” was the default but produced a verbose human format, while
             “mtime” produced a ISO-8601-like format. The behaviours have been swapped
             (so “mtime” is human, “isomtime” is ISO-like), and the default is now
             “mtime”. “isomtime” is now a real ISO-8601 format (“T” between date and
             time, not a space).
	    create/recreate --list: file status for all files used to get announced
             AFTER the file (with borg < 1.2). Now, file status is announced BEFORE the
             file contents are processed. If the file status changes later (e.g. due to
             an error or a content change), the updated/final file status will be
             printed again.
	    removed deprecated-since-long stuff (deprecated since):
	        command “borg change-passphrase” (2017-02), use “borg key …”
	        option “--keep-tag-files” (2017-01), use “--keep-exclude-tags”
	        option “--list-format” (2017-10), use “--format”
	        option “--ignore-inode” (2017-09), use “--files-cache” w/o “inode”
	        option “--no-files-cache” (2017-09), use “--files-cache=disabled”
	    removed BORG_HOSTNAME_IS_UNIQUE env var. to use borg you must implement one
             of these 2 scenarios:
	            the combination of FQDN and result of uuid.getnode() must be unique
                     and stable (this should be the case for almost everybody, except
                     when having duplicate FQDN and MAC address or all-zero MAC address)
	            if you are aware that 1) is not the case for you, you must set
                     BORG_HOST_ID env var to something unique.
	    exit with 128 + signal number, #5161. if you have scripts expecting rc == 2
             for a signal exit, you need to update them to check for >= 128.
	Fixes:
	    diff: reduce memory consumption, fix is_hardlink_master, #6295
	    compact: fix / improve freeable / freed space log output
	        derive really freed space from quota use before/after, #5679
	        do not say “freeable”, but “maybe freeable” (based on hint, unsure)
	    fix race conditions in internal SaveFile function, #6306 #6028
	    implement internal safe_unlink (was: truncate_and_unlink) function more
             safely: usually it does not truncate any more, only under “disk full”
             circumstances and only if there is only one hardlink. see:
             https://github.com/borgbackup/borg/discussions/6286
	Other changes:
	    info: use a pre12-meta cache to accelerate stats for borg < 1.2 archives.
             the first time borg info is invoked on a borg 1.1 repo, it can take a
             rather long time computing and caching some stats values for 1.1 archives,
             which borg 1.2 archives have in their archive metadata structure. be
             patient, esp. if you have lots of old archives. following invocations are
             much faster due to the cache. related change: add archive name to
             calc_stats progress display.
	    docs:
	        add borg 1.2 upgrade notes, #6217
	        link to borg placeholders and borg patterns help
	        init: explain the encryption modes better
	        clarify usage of patternfile roots
	        put import-tar docs into same file as export-tar docs
	        explain the difference between a path that ends with or without a slash,
                 #6297

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>