Create breakpoint.h with decls related to breakpoints
diff --git a/sysdeps/linux-gnu/events.c b/sysdeps/linux-gnu/events.c
index b6c12ef..79f6817 100644
--- a/sysdeps/linux-gnu/events.c
+++ b/sysdeps/linux-gnu/events.c
@@ -12,6 +12,7 @@
 #include <unistd.h>
 
 #include "common.h"
+#include "breakpoint.h"
 
 static Event event;