Elimination of some warnings

src/sfizz/effects/gen/compressor.cxx

@@ -82,6 +82,7 @@ class faustCompressor {
 	}
 
 	static void classInit(int sample_rate) {
+		(void)sample_rate;
 	}
 
 	void instanceConstants(int sample_rate) {

src/sfizz/effects/gen/disto_stage.cxx

@@ -55,6 +55,7 @@ class faustDistoSIG0 {
 	}
 
 	void instanceInitfaustDistoSIG0(int sample_rate) {
+		(void)sample_rate;
 		for (int l3 = 0; (l3 < 2); l3 = (l3 + 1)) {
 			iRec3[l3] = 0;
 		}

src/sfizz/effects/gen/fverb.cxx

@@ -58,6 +58,7 @@ class faustFverbSIG0 {
 	}
 
 	void instanceInitfaustFverbSIG0(int sample_rate) {
+		(void)sample_rate;
 		for (int l4 = 0; (l4 < 2); l4 = (l4 + 1)) {
 			iRec19[l4] = 0;
 		}

src/sfizz/effects/gen/gate.cxx

@@ -85,6 +85,7 @@ class faustGate {
 	}
 
 	static void classInit(int sample_rate) {
+		(void)sample_rate;
 	}
 
 	void instanceConstants(int sample_rate) {