Adds an aditional symbol to allow dynamic linking.

--- src/libapparmor.map
+++ src/libapparmor.map
@@ -94,6 +94,7 @@
 		_aa_autoclose;
 		_aa_autofclose;
 		_aa_dirat_for_each;
+		_aa_asprintf;
 	local:
 		*;
 };