Error on compilation: memory.h (Issue #706)

memory.h -> string.h

src/opus_decoder/opus_decoder.h

@@ -4,7 +4,7 @@
 //#pragma GCC diagnostic ignored "-Wnarrowing"
 
 #include <stdint.h>
-#include <memory.h>
+#include <string.h>
 #include <vector>
 using namespace std;