Make run faster on ARM CPUs using fast math approximation

Use --fast-math to use sine/cosine tables and approximate atan2.

src/jolly/main.c

@@ -182,6 +182,8 @@ int main(int argc, char *argv[])
 		goto fail;
 	}
 
+	/* inits */
+	fm_init(fast_math);
 	init_voice(samplerate);
 	dsp_init();
 
@@ -202,6 +204,9 @@ fail:
 	while (sender_head)
 		jolly_destroy(sender_head);
 
+	/* exits */
+	fm_exit();
+
 	return 0;
 }