CMakeLists: Add source files directly to amuse target

Same thing, less to read.

CMakeLists.txt

@@ -15,72 +15,70 @@ if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/boo AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}
   add_subdirectory(athena)
 endif()
 
-set(SOURCES
+add_library(amuse
   lib/AudioGroup.cpp
   lib/AudioGroupData.cpp
   lib/AudioGroupPool.cpp
   lib/AudioGroupProject.cpp
   lib/AudioGroupSampleDirectory.cpp
+  lib/Common.cpp
+  lib/ContainerRegistry.cpp
   lib/DirectoryEnumerator.cpp
+  lib/DSPCodec.cpp
+  lib/EffectChorus.cpp
+  lib/EffectDelay.cpp
+  lib/EffectReverb.cpp
   lib/Emitter.cpp
   lib/Engine.cpp
   lib/Envelope.cpp
   lib/Listener.cpp
+  lib/N64MusyXCodec.cpp
   lib/Sequencer.cpp
-    lib/SoundMacroState.cpp
   lib/SongConverter.cpp
   lib/SongState.cpp
-    lib/Voice.cpp
-    lib/Submix.cpp
+  lib/SoundMacroState.cpp
   lib/Studio.cpp
-    lib/EffectReverb.cpp
-    lib/EffectChorus.cpp
-    lib/EffectDelay.cpp
-    lib/ContainerRegistry.cpp
-    lib/Common.cpp
-    lib/DSPCodec.cpp
-    lib/N64MusyXCodec.cpp
-    lib/VolumeTable.cpp)
+  lib/Submix.cpp
+  lib/Voice.cpp
+  lib/VolumeTable.cpp
 
-set(HEADERS
+  include/amuse/amuse.hpp
   include/amuse/AudioGroup.hpp
   include/amuse/AudioGroupData.hpp
   include/amuse/AudioGroupPool.hpp
   include/amuse/AudioGroupProject.hpp
   include/amuse/AudioGroupSampleDirectory.hpp
+  include/amuse/Common.hpp
+  include/amuse/ContainerRegistry.hpp
   include/amuse/DirectoryEnumerator.hpp
+  include/amuse/DSPCodec.hpp
+  include/amuse/EffectBase.hpp
+  include/amuse/EffectChorus.hpp
+  include/amuse/EffectDelay.hpp
+  include/amuse/EffectReverb.hpp
   include/amuse/Emitter.hpp
   include/amuse/Engine.hpp
   include/amuse/Entity.hpp
   include/amuse/Envelope.hpp
-    include/amuse/Listener.hpp
-    include/amuse/Sequencer.hpp
-    include/amuse/SoundMacroState.hpp
-    include/amuse/SongConverter.hpp
-    include/amuse/SongState.hpp
-    include/amuse/Voice.hpp
-    include/amuse/Submix.hpp
-    include/amuse/Studio.hpp
   include/amuse/IBackendSubmix.hpp
   include/amuse/IBackendVoice.hpp
   include/amuse/IBackendVoiceAllocator.hpp
-    include/amuse/EffectBase.hpp
-    include/amuse/EffectReverb.hpp
-    include/amuse/EffectChorus.hpp
-    include/amuse/EffectDelay.hpp
-    include/amuse/ContainerRegistry.hpp
-    include/amuse/Common.hpp
-    include/amuse/amuse.hpp
-    include/amuse/DSPCodec.hpp
+  include/amuse/Listener.hpp
   include/amuse/N64MusyXCodec.hpp
-    include/amuse/VolumeTable.hpp)
+  include/amuse/Sequencer.hpp
+  include/amuse/SongConverter.hpp
+  include/amuse/SoundMacroState.hpp
+  include/amuse/SongState.hpp
+  include/amuse/Submix.hpp
+  include/amuse/Studio.hpp
+  include/amuse/Voice.hpp
+  include/amuse/VolumeTable.hpp
+)
+
 if(NX)
-  list(APPEND HEADERS include/switch_math.hpp)
+  target_sources(amuse PRIVATE include/switch_math.hpp)
 endif()
 
-add_library(amuse
-            ${SOURCES}
-            ${HEADERS})
 target_atdna(amuse atdna_AudioGroupPool.cpp include/amuse/AudioGroupPool.hpp)
 target_atdna(amuse atdna_AudioGroupProject.cpp include/amuse/AudioGroupProject.hpp)
 target_atdna(amuse atdna_AudioGroupSampleDirectory.cpp include/amuse/AudioGroupSampleDirectory.hpp)