Attempt at shared secret authentication for libotr 4.0.0

Bug exists where second attempt always gets stuck

src/otr/otr.h

@@ -37,6 +37,7 @@ GHashTable* otr_smpinitators(void);
 void (*otr_init)(void);
 char* (*otr_libotr_version)(void);
 char* (*otr_start_query)(void);
+void (*otr_poll)(void);
 void (*otr_on_connect)(ProfAccount *account);
 void (*otr_keygen)(ProfAccount *account);