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/LibIPC/CMakeLists.txt

@@ -16,5 +16,5 @@ else()
         TransportSocketWindows.cpp)
 endif()
 
-serenity_lib(LibIPC ipc)
+ladybird_lib(LibIPC ipc)
 target_link_libraries(LibIPC PRIVATE LibCore LibURL LibThreading)