Add realpath Prototype

[Joel Sherrill]

Hi

I added the realpath() prototype more or less where
glibc has it in stdlib.h.

Also added restrict to Linux implementation.

Does this look ok to commit?

2013-11-18  Joel Sherrill <joel.sherrill@oarcorp.com>

        * libc/include/stdlib.h: Add prototype of realpath().
        * libc/sys/linux/realpath.c: Add restrict keyword.


-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill@OARcorp.com        On-Line Applications Research
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Index: libc/include/stdlib.h
===================================================================
RCS file: /cvs/src/src/newlib/libc/include/stdlib.h,v
retrieving revision 1.46
diff -u -r1.46 stdlib.h
--- libc/include/stdlib.h	18 Nov 2013 17:26:51 -0000	1.46
+++ libc/include/stdlib.h	18 Nov 2013 18:19:50 -0000
@@ -118,6 +118,8 @@
 int	_EXFUN(_mkstemps_r, (struct _reent *, char *, int));
 char *	_EXFUN(_mktemp_r, (struct _reent *, char *) _ATTRIBUTE ((__warning__ ("the use of `mktemp' is dangerous; use `mkstemp' instead"))));
 #endif
+char *	_EXFUN(realpath, (const char *__restrict path, char *__restrict resolved_path));
+_VOID	_EXFUN(qsort,(_PTR __base, size_t __nmemb, size_t __size, __compar_fn_t _compar));
 _VOID	_EXFUN(qsort,(_PTR __base, size_t __nmemb, size_t __size, __compar_fn_t _compar));
 int	_EXFUN(rand,(_VOID));
 _PTR	_EXFUN_NOTHROW(realloc,(_PTR __r, size_t __size));
Index: libc/sys/linux/realpath.c
===================================================================
RCS file: /cvs/src/src/newlib/libc/sys/linux/realpath.c,v
retrieving revision 1.1
diff -u -r1.1 realpath.c
--- libc/sys/linux/realpath.c	9 Dec 2000 01:20:32 -0000	1.1
+++ libc/sys/linux/realpath.c	18 Nov 2013 18:19:54 -0000
@@ -69,7 +69,7 @@
 }
 
 
-char *realpath(const char *path,char *resolved_path)
+char *realpath(const char *__restrict path,char *__restrict resolved_path)
 {
     char cwd[PATH_MAX];
     char *path_copy;