remove support for non-ANSI compilation

*** 64,75 ****
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
- #if defined(__STDC__)
- 
  #if defined(__EXTENSIONS__) || \
          (!defined(_STRICT_STDC) && !defined(__XOPEN_OR_POSIX)) || \
          defined(_XPG6) || defined(_REENTRANT)
  extern int strerror_r(int, char *, size_t);
  #endif
--- 64,73 ----
*** 189,256 ****
  #endif  /* unix */
  
  #endif  /* __GNUC__ */
  #endif  /* __EXTENSIONS__ ... */
  
- #else   /* __STDC__ */
- 
- #if defined(__EXTENSIONS__) || !defined(__XOPEN_OR_POSIX) || \
-         defined(_XPG6) || defined(_REENTRANT)
- extern int strerror_r();
- #endif
- 
- #if defined(__EXTENSIONS__) || !defined(__XOPEN_OR_POSIX) || \
-         (_POSIX_C_SOURCE - 0 >= 199506L) || defined(_REENTRANT)
- extern char *strtok_r();
- #endif
- 
- #if defined(__EXTENSIONS__) || !defined(_STRICT_STDC) || \
-         defined(__XOPEN_OR_POSIX)
- extern void *memccpy();
- #endif
- 
- #if defined(_XPG7) || !defined(_STRICT_SYMBOLS)
- extern int strcasecmp();
- extern int strncasecmp();
- extern int strcasecmp_l();
- extern int strncasecmp_l();
- extern char *stpcpy();
- extern char *stpncpy();
- extern char *strndup();
- extern size_t strnlen();
- extern char *strsignal();
- #endif
- 
- #if !defined(_STRICT_SYMBOLS)
- extern int uucopy();
- extern int uucopystr();
- extern int ffs();
- extern int ffsl();
- extern int ffsll();
- extern int fls();
- extern int flsl();
- extern int flsll();
- extern char *strcasestr();
- extern char *strcasestr_l();
- extern char *strnstr();
- extern size_t strlcpy();
- extern size_t strlcat();
- extern char *strsep();
- extern char *strchrnul();
- #endif /* _STRICT_SYMBOLS */
- 
- #if defined(__EXTENSIONS__) || !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2)
- extern char *strdup();
- #endif
- 
- #if defined(_XPG7) || !defined(_STRICT_SYMBOLS)
- extern size_t strcoll_l();
- extern size_t strxfrm_l();
- #endif
- 
- #endif  /* __STDC__ */
- 
  #ifdef  __cplusplus
  }
  #endif
  
  #endif  /* _STRING_H */
--- 187,196 ----