lib: Fix version script node ordering

The order of the VERSION nodes is such that the new node name goes first
and the one it depends on goes after the commands. See
https://sourceware.org/binutils/docs/ld/VERSION.html.

Closes: #398
Approved by: cgwalters

src/libostree/libostree.sym

@@ -352,8 +352,8 @@ global:
  */
 
 /* UNCOMMENT WHEN ADDING THE FIRST NEW SYMBOL FOR 2016.8
-LIBOSTREE_2016.7 {
+LIBOSTREE_2016.8 {
 global:
 	insert_symbol_here;
-} LIBOSTREE_2016.8;
+} LIBOSTREE_2016.7;
 */