Compatibility with versions prior to 2.8.12 is being deprecated,
resulting in build warning messages. The minimum for the official
supported distros is 3.7.2 (Stretch), so the version could be moved
forward when newer features are required.
Reference: https://cmake.org/cmake/help/v3.19/release/3.19.html#deprecated-and-removed-features
Append CMAKE_CXX_FLAGS and CMAKE_C_FLAGS instead of setting. Setting the
variables causes breakage in cross-compiled systems where sysroots and
machine types are set.
One usage of the macro remains in the bundled libmygpo-qt5. This should
be updated once the pending upstream fix was merged. qtsingleapplication
is already fixed upstream.
- Rewrite gstspectrum (1.0) to use FFTW (2x faster) and emit raw magnitude
values (not log scaled).
- Rewrite the moodbar generation code to be somewhat understandable, and
do it in Clementine instead of gstreamer.
