Defines in src/td-posix

• BAD_THREAD src/td-posix/thread.h:25
• uae_sem_destroy src/td-posix/thread.h:16
• uae_sem_getvalue src/td-posix/thread.h:20
• uae_sem_init src/td-posix/thread.h:15
• uae_sem_post src/td-posix/thread.h:17
• uae_sem_trywait src/td-posix/thread.h:19
• uae_sem_wait src/td-posix/thread.h:18
• UAE_THREAD_EXIT src/td-posix/thread.h:37