libobs: Remove obs_output_signal_delay

The function is never called, documented or exported.

libobs/obs-output-delay.c

@@ -146,17 +146,6 @@ void process_delay(void *data, struct encoder_packet *packet,
 		;
 }
 
-void obs_output_signal_delay(obs_output_t *output, const char *signal)
-{
-	struct calldata params;
-	uint8_t stack[128];
-
-	calldata_init_fixed(&params, stack, sizeof(stack));
-	calldata_set_ptr(&params, "output", output);
-	calldata_set_int(&params, "sec", output->active_delay_ns / 1000000000);
-	signal_handler_signal(output->context.signals, signal, &params);
-}
-
 bool obs_output_delay_start(obs_output_t *output)
 {
 	struct delay_data dd = {