code cleanup: remove dead code

src/libespeak-ng/speech.c

 					// sound was previously open with a different sample rate
 					audio_object_close(my_audio);
 					out_samplerate = 0;
-#ifdef HAVE_SLEEP
-					sleep(1);
-#endif
 				}
 #endif
 #if USE_LIBPCAUDIO

src/libespeak-ng/wavegen.c

 		}
 
 		// apply main peaks, formants 0 to 5
-#ifdef USE_ASSEMBLER_1
-		// use an optimised routine for this loop, if available
-		total += AddSineWaves(waveph, h_switch_sign, maxh, harmspect);  // call an assembler code routine
-#else
 		theta = waveph;
 
 		for (h = 1; h <= h_switch_sign; h++) {
 			theta += waveph;
 			h++;
 		}
-#endif
 
 		if (voicing != 64)
 			total = (total >> 6) * voicing;