src/Makefile.am: Install D-Bus policy in /usr/share, not /etc

[gioele]

From https://bugs.debian.org/1006631:

dbus supports policy files in both /usr/share/dbus-1/system.d and
/etc/dbus-1/systemd. [The] recently released dbus 1.14.0, officially
deprecates installing packages' default policies into /etc/dbus-1/systemd,
instead reserving it for the sysadmin. This is the same idea as the
difference between /usr/lib/udev/rules.d and /etc/udev/rules.d.

[arkq]

I wonder how this will affect systems with older versions of dbus. Will it read the configuration correctly?

Also, the right place to change the default would be here:
https://github.com/arkq/bluez-alsa/blob/master/configure.ac#L345
According to the dbus-1.pc file on Debian 12: --variable=sysconfdir -> --variable=datadir

But also, it will be required to check whether the datadir variable was provided in older versions of dbus.

And another question is whether we need to provide customization for that directory in the configure.ac after all. Maybe configuration should just read the value from the pkg-config file and that's all...

[gioele]

Also, the right place to change the default would be here: https://github.com/arkq/bluez-alsa/blob/master/configure.ac#L345 According to the dbus-1.pc file on Debian 12: --variable=sysconfdir -> --variable=datadir

Right. I amended the PR.

I wonder how this will affect systems with older versions of dbus. Will it read the configuration correctly?

D-Bus reads from /usr since version 1.10, released in 2015: https://sources.debian.org/src/dbus/1.10.32-0%2Bdeb9u1/NEWS/#L483-L499

But also, it will be required to check whether the datadir variable was provided in older versions of dbus.

datadir has been added to dbus-1.pc in 2014: https://salsa.debian.org/utopia-team/dbus/-/commit/95fe17a96d0488da79c5773da9b86b5431fa28c9

[arkq]

D-Bus reads from /usr since version 1.10, released in 2015

OK, so I think that we can change the default then.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02% ⚠️

Comparison is base (5534708) 71.11% compared to head (3c915bf) 71.10%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #657      +/-   ##
==========================================
- Coverage   71.11%   71.10%   -0.02%     
==========================================
  Files          47       47              
  Lines        9011     9011              
==========================================
- Hits         6408     6407       -1     
- Misses       2603     2604       +1     

see 3 files with indirect coverage changes

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