Massive removal of unused modules

src/audio_core/CMakeLists.txt

@@ -1,44 +0,0 @@
-set(SRCS
-            audio_core.cpp
-            codec.cpp
-            hle/dsp.cpp
-            hle/filter.cpp
-            hle/mixers.cpp
-            hle/pipe.cpp
-            hle/source.cpp
-            interpolate.cpp
-            sink_details.cpp
-            time_stretch.cpp
-            )
-
-set(HEADERS
-            audio_core.h
-            codec.h
-            hle/common.h
-            hle/dsp.h
-            hle/filter.h
-            hle/mixers.h
-            hle/pipe.h
-            hle/source.h
-            interpolate.h
-            null_sink.h
-            sink.h
-            sink_details.h
-            time_stretch.h
-            )
-
-if(SDL2_FOUND)
-    set(SRCS ${SRCS} sdl2_sink.cpp)
-    set(HEADERS ${HEADERS} sdl2_sink.h)
-endif()
-
-create_directory_groups(${SRCS} ${HEADERS})
-
-add_library(audio_core STATIC ${SRCS} ${HEADERS})
-target_link_libraries(audio_core PUBLIC common core)
-target_link_libraries(audio_core PRIVATE SoundTouch)
-
-if(SDL2_FOUND)
-    target_link_libraries(audio_core PRIVATE SDL2)
-    target_compile_definitions(audio_core PRIVATE HAVE_SDL2)
-endif()