hash.c: #include <reent.h>

This is needed for the prototypes of _stat64 and _fstat64 on Cygwin.

Fixes: commit 279805b2 "hash functions: use reentrant stat functions".

newlib/libc/search/hash.c

@@ -43,6 +43,7 @@ static char sccsid[] = "@(#)hash.c	8.9 (Berkeley) 6/16/94";
 
 #include <sys/stat.h>
 
+#include <reent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>