make: unifdef for other OSes (undefined)

*** 30,44 ****
  #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
  
--- 30,39 ----