CMake: Rename serenity_* helper functions/macros to ladybird_*

Author: https://github.com/ayeteadoe
Commit: 25f5936dee
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5249
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWebSocket/CMakeLists.txt

@@ -5,5 +5,5 @@ set(SOURCES
     WebSocket.cpp
 )
 
-serenity_lib(LibWebSocket websocket)
+ladybird_lib(LibWebSocket websocket)
 target_link_libraries(LibWebSocket PRIVATE LibCore LibCrypto LibTLS LibURL LibDNS)