Protobuf 3.15 adds a namespace alias for "pb" that conflicts with
Clementine's. Modify Clementine to use "cpb".
Patch provided by @ahesford
Reference: 5c028d6cf4/src/google/protobuf/port.h (L44)
* Changing ClearSearchResults order.
If search_ is null, there is no point in clearing it.
* Update to fix 12 (Crash when searching under Internet tab with Spotify)
* Formatting Fixes