Enhance sock_addr_local syscall (#1320)

Slightly change the __wasi_sock_addr_local interface - since we already have
a `__wasi_addr_t` structure which is an union, there's no need for passing the
length around - the address buffer will always have the right length (i.e. max
of all address families).

core/shared/platform/linux-sgx/sgx_socket.c

@@ -105,7 +105,7 @@ htonl(uint32 value)
     return value;
 }
 
-static uint32
+uint32
 ntohl(uint32 value)
 {
     return htonl(value);
@@ -632,4 +632,13 @@ os_socket_addr_resolve(const char *host, const char *service,
     return BHT_ERROR;
 }
 
+int
+os_socket_addr_local(bh_socket_t socket, uint8_t *buf, size_t buflen,
+                     uint16_t *port, uint8_t *is_ipv4)
+{
+    errno = ENOSYS;
+
+    return BHT_ERROR;
+}
+
 #endif

core/shared/platform/linux-sgx/sgx_socket.h

@@ -95,6 +95,9 @@ struct sockaddr {
     char sa_data[14];             /* Address data.  */
 };
 
+uint32_t
+ntohl(uint32_t value);
+
 int
 socket(int domain, int type, int protocol);