remove support for non-ANSI compilation

*** 21,30 ****
--- 21,32 ----
  /*      Copyright (c) 1988 AT&T */
  /*        All Rights Reserved   */
  
  
  /*
+  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
+  *
   * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  #ifndef _UCONTEXT_H
*** 46,63 ****
  #else
  #define makecontext     __makecontext_v2
  #endif
  #endif
  
- #if defined(__STDC__)
- 
  extern int getcontext(ucontext_t *) __RETURNS_TWICE;
  #pragma unknown_control_flow(getcontext)
  extern int setcontext(const ucontext_t *) __NORETURN;
  extern int swapcontext(ucontext_t *_RESTRICT_KYWD,
                  const ucontext_t *_RESTRICT_KYWD);
  extern void makecontext(ucontext_t *, void(*)(), int, ...);
  #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
  extern int walkcontext(const ucontext_t *, int (*)(uintptr_t, int, void *),
      void *);
  extern int printstack(int);
  extern int addrtosymstr(void *, char *, int);
--- 48,64 ----
  #else
  #define makecontext     __makecontext_v2
  #endif
  #endif
  
  extern int getcontext(ucontext_t *) __RETURNS_TWICE;
  #pragma unknown_control_flow(getcontext)
  extern int setcontext(const ucontext_t *) __NORETURN;
  extern int swapcontext(ucontext_t *_RESTRICT_KYWD,
                  const ucontext_t *_RESTRICT_KYWD);
  extern void makecontext(ucontext_t *, void(*)(), int, ...);
+ 
  #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
  extern int walkcontext(const ucontext_t *, int (*)(uintptr_t, int, void *),
      void *);
  extern int printstack(int);
  extern int addrtosymstr(void *, char *, int);
*** 68,101 ****
  extern int stack_setbounds(const stack_t *);
  extern int stack_inbounds(void *);
  extern int stack_violation(int, const siginfo_t *, const ucontext_t *);
  
  extern void *_stack_grow(void *);
! #endif
! #else
  
- extern int getcontext() __RETURNS_TWICE;
- #pragma unknown_control_flow(getcontext)
- extern int setcontext();
- extern int swapcontext();
- extern void makecontext();
- #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
- extern int walkcontext();
- extern int printstack();
- extern int addrtosymstr();
- extern int getustack();
- extern int setustack();
- 
- extern int stack_getbounds();
- extern int stack_setbounds();
- extern int stack_inbounds();
- extern int stack_violation();
- 
- extern void *_stack_grow();
- #endif
- #endif
- 
  #ifdef  __cplusplus
  }
  #endif
  
  #endif  /* _UCONTEXT_H */
--- 69,80 ----
  extern int stack_setbounds(const stack_t *);
  extern int stack_inbounds(void *);
  extern int stack_violation(int, const siginfo_t *, const ucontext_t *);
  
  extern void *_stack_grow(void *);
! #endif  /* !_XPG4_2 || __EXTENSIONS__ */
  
  #ifdef  __cplusplus
  }
  #endif
  
  #endif  /* _UCONTEXT_H */