Don't pass more than G_MAXSSIZE bytes at once to write() in glib/gfileutils.c

Behaviour in that case is implementation-defined and how many bytes were
actually written can't be expressed by the return value anymore.

Instead do a short write of G_MAXSSIZE bytes and let the existing loop
for handling short writes takes care of the remaining length.

glib/gfileutils.c

@@ -1157,7 +1157,7 @@ write_to_file (const gchar  *contents,
     {
       gssize s;
 
-      s = write (fd, contents, length);
+      s = write (fd, contents, MIN (length, G_MAXSSIZE));
 
       if (s < 0)
         {