make sys/random.h inclusion conditional

NetBSD doesn't have it.

Author: yamt

lib/wasi.c

@@ -33,7 +33,6 @@
 #include <nuttx/config.h>
 #endif
 
-#include <sys/random.h> /* getrandom */
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/time.h>
@@ -53,6 +52,10 @@
 #include <time.h>
 #include <unistd.h>
 
+#if defined(__GLIBC__) || defined(__NuttX__)
+#include <sys/random.h> /* getrandom */
+#endif
+
 #include "context.h"
 #include "endian.h"
 #include "exec.h"