mesa: Remove target parameter from dd_function_table::UnmapBuffer

No driver used that parameter, and most drivers ended up with a bunch
of unused-parameter warnings because it was there.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/mesa/main/api_arrayelt.c

@@ -1622,9 +1622,7 @@ void _ae_unmap_vbos( struct gl_context *ctx )
    assert (!actx->NewState);
 
    for (i = 0; i < actx->nr_vbos; i++)
-      ctx->Driver.UnmapBuffer(ctx,
-			      GL_ARRAY_BUFFER_ARB,
-			      actx->vbo[i]);
+      ctx->Driver.UnmapBuffer(ctx, actx->vbo[i]);
 
    actx->mapped_vbos = GL_FALSE;
 }