Use accumulated find exec, which will run strip-nondeterminism only once
and thus not masking any faild run.

Co-authored-by: David Runge <dvzrv@archlinux.org>
Signed-off-by: Max Harmathy <harmathy@secure.mailbox.org>

Fix maven call.
Switch to correct SPDX license identifier for project.
Use bash arrays with one entry per line for easier handling.
Make start script more robust by specifying the java major version in the build script and modifying the PATH used in
the start script with it.
Add required JVM parameters in start script (thanks to Sebastian Wiesner) and prevent application from doing update
checks.

Remove unnecessary quotes and curly braces.
Remove unneeded patches.

Add patch to update included log4j to 2.17.0 to fix CVE-2021-45105.

Add patch to upgrade log4j to 2.16.0 to mitigate CVE-2021-45046.

This release integrates a log4j version that is not affected by CVE-2021-44228.
Simplify quoting in file.
Use strip-nondeterminism to strip the created jars of non-reproducible timestamps.

Switch back to using source tarballs, as a development release is no longer required.

As 13.7.1 has been broken with java-runtime > 15 for several months and
upstream has still not released a new (pre-release) version, we pin the latest
commit on the develop branch and build from that instead:
https://github.com/mediathekview/MediathekView/issues/610

Remove the now unneeded --enable-preview flag from the java call in the wrapper
script.

Pin the required java-runtime version to 15.

Updating checksum of source tarball as well, as upstream retagged 13.5.1:
https://github.com/mediathekview/MediathekView/issues/517
Setting PATH in mediathekview.sh to current java-runtime=14 based PATH (FS#66902).