Add Linux SGX support (#106)

core/shared-lib/platform/alios/bh_platform.h

@@ -52,6 +52,8 @@ typedef int64_t int64;
 #define wa_free bh_free
 #define wa_strdup bh_strdup
 
+#define bh_printf printf
+
 typedef aos_task_t korp_thread;
 typedef korp_thread *korp_tid;
 typedef aos_task_t *aos_tid_t;