remove support for non-ANSI compilation

@@ -64,12 +64,10 @@
 
 #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

@@ -189,68 +187,10 @@
 #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 */