Macros in src/td-sdl

• uae_sem_destroy src/td-sdl/thread.h:19
• uae_sem_getvalue src/td-sdl/thread.h:23
• uae_sem_init src/td-sdl/thread.h:16
• uae_sem_post src/td-sdl/thread.h:20
• uae_sem_trywait src/td-sdl/thread.h:22
• uae_sem_wait src/td-sdl/thread.h:21