drop const from return

rtaudio_c.cpp

@@ -23,7 +23,7 @@ const rtaudio_api_t *rtaudio_compiled_api() {
 }
 
 extern "C" const unsigned int rtaudio_num_compiled_apis;
-const unsigned int rtaudio_num_compiled_api(void) {
+unsigned int rtaudio_num_compiled_api(void) {
   return rtaudio_num_compiled_apis;
 }
 

rtaudio_c.h

@@ -106,7 +106,7 @@ typedef struct rtaudio_stream_options {
 typedef struct rtaudio *rtaudio_t;
 
 RTAUDIOAPI const char *rtaudio_version(void);
-RTAUDIOAPI const unsigned int rtaudio_num_compiled_api(void);
+RTAUDIOAPI unsigned int rtaudio_num_compiled_api(void);
 RTAUDIOAPI const rtaudio_api_t *rtaudio_compiled_api(void);
 RTAUDIOAPI const char *rtaudio_api_name(rtaudio_api_t api);
 RTAUDIOAPI const char *rtaudio_api_display_name(rtaudio_api_t api);