[cluttermm_tutorial] Rename actor_events example to use .cc instead of .cpp.

[Murray Cumming <murrayc src gnome org>]

commit afc60f7b218b1b9b17c03e2231e2320088bd1cba
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Mar 28 20:33:04 2016 +0200

    Rename actor_events example to use .cc instead of .cpp.

 examples/actor_events/{main.cpp => main.cc} |    0
 1 files changed, 0 insertions(+), 0 deletions(-)
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diff --git a/examples/actor_events/main.cpp b/examples/actor_events/main.cc
similarity index 100%
rename from examples/actor_events/main.cpp
rename to examples/actor_events/main.cc