event_pipe: replaced PIPE_EVENT_SIGNAL with main_notify

There is only one location using PIPE_EVENT_SIGNAL: to synchronize
player_command() with player_command_finished().  Use the "notify"
library instead of the event_pipe here.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/main.h b/src/main.h
index 8943280a..0db28926 100644
--- a/src/main.h
+++ b/src/main.h
@@ -21,4 +21,6 @@
 
 extern GMainLoop *main_loop;
 
+extern struct notify main_notify;
+
 #endif