libstage: bump libstage for new render_func

Newer libstage enables the render_func to free its stage node via
return value.  This is useful for fire-and-forget style ephemeral
nodes that make for convenient autonomous stage nodes which
remove themselves after running their course.  Think bonus scores
and little visual effects...

Requires some mechanical changes to the existing render funcs,
but nothing functionally has really changed.

1 files changed, 0 insertions, 0 deletions

diff --git a/libstage b/libstage
-Subproject 19acc6de674d44d44f8d3bcb66568de3e5abfe3
+Subproject 55ce5773333b41229798c2a9b238812660707b7