libdpkg: Add missing dpkg_error functions to the map file

lib/dpkg/libdpkg.map

@@ -1,6 +1,9 @@
 LIBDPKG_0 {
 global:
 	# Error reporting
+	dpkg_put_warn;
+	dpkg_put_error;
+	dpkg_put_errno;
 	dpkg_error_print;
 	dpkg_error_destroy;