fix CMake with latest KOS

Author: GPF

examples/CMakeLists.txt

@@ -79,7 +79,7 @@ macro(add_sdl_example_executable TARGET)
 
     list(APPEND SDL_EXAMPLE_EXECUTABLES ${TARGET})
 if(AST_DATAFILES)
-    if(DREAMCAST)
+    if(PLATFORM_DREAMCAST)
         # Set up romdisk directory
         set(ROMDISK_DIR "${CMAKE_CURRENT_BINARY_DIR}/romdisk_${TARGET}")
         file(MAKE_DIRECTORY "${ROMDISK_DIR}")
@@ -121,7 +121,7 @@ if(AST_DATAFILES)
         endif()
     elseif(PSP)
         target_link_libraries(${TARGET} PRIVATE GL)
-    elseif(DREAMCAST)
+    elseif(PLATFORM_DREAMCAST)
         target_link_libraries(${TARGET} PRIVATE GL pthread)        
     elseif(EMSCRIPTEN)
         set_property(TARGET ${TARGET} PROPERTY SUFFIX ".html")
@@ -218,7 +218,7 @@ if(N3DS)
     endforeach()
 endif()
 
-if(DREAMCAST)
+if(PLATFORM_DREAMCAST)
     foreach(APP ${SDL_EXAMPLE_EXECUTABLES})
         target_link_libraries(${APP} PRIVATE GL pthread)