add defined(ounce)

Author: JoshuaMoelans

include/sentry.h

@@ -83,7 +83,7 @@ extern "C" {
 /* IBM i PASE is also counted as AIX */
 #    define SENTRY_PLATFORM_AIX
 #    define SENTRY_PLATFORM_UNIX
-#elif defined(__NX__)
+#elif defined(__NX__) || defined(__OUNCE__)
 #    define SENTRY_PLATFORM_NX
 #else
 #    error unsupported platform