Fix -Wstrict-prototypes

In preparation for C23.

Signed-off-by: Sam James <sam@gentoo.org>

Author: thesamesam

include/rnnoise.h

@@ -54,12 +54,12 @@ typedef struct RNNModel RNNModel;
 /**
  * Return the size of DenoiseState
  */
-RNNOISE_EXPORT int rnnoise_get_size();
+RNNOISE_EXPORT int rnnoise_get_size(void);
 
 /**
  * Return the number of samples processed by rnnoise_process_frame at a time
  */
-RNNOISE_EXPORT int rnnoise_get_frame_size();
+RNNOISE_EXPORT int rnnoise_get_frame_size(void);
 
 /**
  * Initializes a pre-allocated DenoiseState

src/denoise.c

@@ -274,11 +274,11 @@ void rnnoise_model_free(RNNModel *model) {
   free(model);
 }
 
-int rnnoise_get_size() {
+int rnnoise_get_size(void) {
   return sizeof(DenoiseState);
 }
 
-int rnnoise_get_frame_size() {
+int rnnoise_get_frame_size(void) {
   return FRAME_SIZE;
 }