Update raudio.c

Allow for the use of raudio stand alone

src/raudio.c

@@ -81,7 +81,7 @@
     #include "utils.h"          // Required for: fopen() Android mapping
 #endif
 
-#if defined(SUPPORT_MODULE_RAUDIO)
+#if defined(SUPPORT_MODULE_RAUDIO) || defined(RAUDIO_STANDALONE)
 
 #if defined(_WIN32)
 // To avoid conflicting windows.h symbols with raylib, some flags are defined