Fix compatibility across the board

Change-Id: I6376920775ddabb4d4af505fffd86e404403a64a
diff --git a/twrp.cpp b/twrp.cpp
index 3de35af..859a7fc 100644
--- a/twrp.cpp
+++ b/twrp.cpp
@@ -59,6 +59,8 @@
 struct selabel_handle *selinux_handle;
 #endif
 
+extern int adb_server_main(int is_daemon, int server_port, int /* reply_fd */);
+
 TWPartitionManager PartitionManager;
 int Log_Offset;
 bool datamedia;