core: fuzz - include missing headers file for last changes

misc/fuzz/fuzz_parse_msg.c

@@ -4,6 +4,7 @@
 #include "../parser/contact/parse_contact.h"
 #include "../parser/parse_from.h"
 #include "../parser/parse_to.h"
+#include "../parser/parse_rr.h"
 #include "../parser/parse_refer_to.h"
 #include "../parser/parse_ppi_pai.h"
 #include "../parser/parse_privacy.h"