5875 psignal and psiginfo should not be exposed in environments prior to POSIX 2008

*** 50,61 ****
--- 50,63 ----
  extern const char *_sys_traplist[];
  extern const char *_sys_cldlist[];
  extern const struct siginfolist *_sys_siginfolistp;
  #define _sys_siginfolist        _sys_siginfolistp
  
+ #if defined(_XPG7) || !defined(_STRICT_SYMBOLS)
  extern void psignal(int, const char *);
  extern void psiginfo(const siginfo_t *, const char *);
+ #endif
  
  #ifdef  __cplusplus
  }
  #endif