Fix compilation error

Author: jpbarraca

source/event_gpio.h

@@ -69,6 +69,5 @@ int gpio_is_evented(unsigned int gpio);
 int event_initialise(void);
 void event_cleanup(void);
 int blocking_wait_for_edge(unsigned int gpio, unsigned int edge, int timeout);
-int blocking_wait_for_edge(unsigned int gpio, unsigned int edge);
 
 #endif