[nostalgia,olympic] Cleanup CMake

src/nostalgia/CMakeLists.txt

@@ -1,6 +1,15 @@
 
+project(nostalgia CXX)
+
 #project packages
 
+set(NOSTALGIA_BUILD_PLAYER ON CACHE BOOL "Build Player")
+set(NOSTALGIA_BUILD_STUDIO ON CACHE BOOL "Build Studio")
+
+if(BUILDCORE_TARGET STREQUAL "gba")
+	set(NOSTALGIA_BUILD_STUDIO OFF)
+endif()
+
 if(APPLE)
 	set(CMAKE_INSTALL_NAME_DIR "@executable_path/../Library/nostalgia")
 	set(NOSTALGIA_DIST_BIN              NostalgiaStudio.app/Contents/MacOS)
@@ -17,13 +26,13 @@ endif()
 
 add_subdirectory(modules)
 
-if(NOSTALGIA_BUILD_PLAYER)
+if(${NOSTALGIA_BUILD_PLAYER})
 	add_subdirectory(player)
 endif()
 
-if(TURBINE_BUILD_TYPE STREQUAL "Native")
+if(NOT BUILDCORE_TARGET STREQUAL "gba")
 	add_subdirectory(tools)
-	if(NOSTALGIA_BUILD_STUDIO)
+	if(${NOSTALGIA_BUILD_STUDIO})
 		add_subdirectory(studio)
 	endif()
 endif()