This reverts commit 0c40d2a6.

dependency loop

Gbp-Dch: Full

This will give it Provides: gir1.2-gudev-1.0-dev which libmanette can
build-depend on, in preparation for potentially moving some or all
GIR XML to its own binary packages in future to help with
cross-compilation and bootstrapping.

Helps: #1030223

Changes-By: lintian-brush
Fixes: lintian: out-of-date-standards-version
See-also: https://lintian.debian.org/tags/out-of-date-standards-version.html

Changes-By: lintian-brush

Update to upstream version '238'
with Debian dir 88a53272316d3b392c8f26367a315566dfb3c474

GUdevDevice contains snapshot of information when device object
was created. Cache tags on device creation to follow this rule.

Starting with systemd-udevd 247 tags are "sticky" meaning that once
a tag is assigned to a device it will not be removed from the device
again until the device itself is removed.

New property CURRENT_TAGS has been added that works similar to the
existing TAGS property but only lists tags set by the most recent
uevent/database update.

https://lists.freedesktop.org/archives/systemd-devel/2020-November/045646.html

Add a test for it, as it has a custom cache on top of udev.

Honestly, we could even add that into the API itself, calling the proper
underlying udev function.

Just to make it a bit nicer, no need to assert the number of devices
each time and such.

No need to duplicate this between tests once we add more tests. Also, it
fixes the issue that the testbed was not free'ed resulting in the test
directory to not be deleted.

libudev will strip trailing newline characters ("\r\n") when reading
sysfs attributes. The uncached reading functions however bypassed the
udev mechanism unnecessarily and then added their own cache on top.

Setting the value to NULL clears the internal cache in systemd. As such,
we can simply do this and then fall back to the normal implementation to
implement the _uncached version of the sysfs attribute getters.

These inconsistencies caused devhelp to not find the documentation.
Change things to package_name so that the install location stays
consistent.

Gbp-Dch: Ignore

Spotted by Mike Gilbert:
https://gitlab.gnome.org/GNOME/libgudev/-/merge_requests/20#note_1265114

See https://gitlab.gnome.org/GNOME/libgudev/-/merge_requests/19