Patch - Add restrict for statvfs

[Joel Sherrill]

Hi

Another in the restrict series from Google Code-In students.
This one is a little odd. newlib doesn't have the .h file.
RTEMS does and we could move it to newlib if desirable and
possible to be target independent. But there is only
a single Linux file which needed touching.

OK to commit?

2013-11-21 Daniel Ramirez <javamonn@gmail.com>

	* libc/sys/linux/statvfs.c (statvfs): Added restrict keyword.

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill@OARcorp.com        On-Line Applications Research
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Index: newlib/libc/sys/linux/statvfs.c
===================================================================
RCS file: /cvs/src/src/newlib/libc/sys/linux/statvfs.c,v
retrieving revision 1.1
diff -u -r1.1 statvfs.c
--- newlib/libc/sys/linux/statvfs.c	24 Jul 2002 20:38:32 -0000	1.1
+++ newlib/libc/sys/linux/statvfs.c	21 Nov 2013 15:57:47 -0000
@@ -30,7 +30,7 @@
 
 
 int
-statvfs (const char *file, struct statvfs *buf)
+statvfs (const char *__restrict file, struct statvfs *__restrict buf)
 {
   struct statfs fsbuf;
   struct stat64 st;