vbo: Fix build on windows.

src/mesa/vbo/vbo_split_inplace.c

@@ -59,11 +59,11 @@ struct split_context {
 static void flush_vertex( struct split_context *split )
 {
    GLuint min_index, max_index;
+   GLuint i;
 
    if (!split->dstprim_nr) 
       return;
 
-   GLuint i;
    min_index = split->dstprim[0].start;
    max_index = min_index + split->dstprim[0].count - 1;