Clementine needs TagLib 1.8 and sparsehash to be able to use Google Drive.
However, most Linux distribution provide an older Taglib release (1.8 was released recently).
But Taglib 1.8 has been added to Clementine's 3rd party libraries since 1.1 was released (in case the already installed version of Taglib is < 1.8, this one will be used) so, waiting for the next release, you can try to recompile it yourself using the last git code, after installing sparsehash.
About SoundCloud, it has no special dependencies so it should be visible and working: you can access it through global search or in the Internet tab.