gnu: clementine: Remove Spotify downloader.

gnu: clementine: Remove Spotify downloader.

Clementine has a button in the preference menu that allows downloading a
binary blob to add support for Spofify.  Let's remove this button.  It turns
out this is the only part of the code base that uses crypto++, let's remove
this dependency too.

* gnu/packages/music.scm (clementine)[arguments]: Remove crypto++ support. Set
HAVE_SPOTIFY_DOWNLOADER to FALSE.
[inputs]: Remove crypto++ input.
* gnu/packages/patches/clementine-remove-crypto++-dependency.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

Signed-off-by: Leo Famulari <leo@famulari.name>