make: unifdef for other OSes (undefined)

@@ -30,15 +30,10 @@
 #ifndef _BSD_BSD_H
 #define _BSD_BSD_H
 
 #include <signal.h>
 
-#if defined (HP_UX) || defined (linux)
-typedef void SIG_FUNC_TYP(int);
-typedef SIG_FUNC_TYP *SIG_TYP;
-#define SIG_PF SIG_TYP
-#endif
 
 #ifndef __cplusplus
 typedef void (*SIG_PF) (int);
 #endif