5798 fexecve() needed per POSIX 2008

*** 288,297 ****
--- 288,300 ----
  extern int execle(const char *, const char *, ...);
  extern int execlp(const char *, const char *, ...);
  extern int execv(const char *, char *const *);
  extern int execve(const char *, char *const *, char *const *);
  extern int execvp(const char *, char *const *);
+ #if defined(_XPG7) || !defined(_STRICT_SYMBOLS)
+ extern int fexecve(int, char *const[], char *const[]);
+ #endif
  extern void _exit(int)
          __NORETURN;
  /*
   * The following fattach prototype is duplicated in <stropts.h>. The
   * duplication is necessitated by XPG4.2 which requires the prototype