Make gdb.ada/ptype_tagged_param.exp pass

gdb.ada/ptype_tagged_param.exp is failing for me on x86-64 Fedora 36.
However, it's actually generating the correct output -- it is just
that the test thinks that the "ptype" will not work because I do not
have the GNAT debuginfo installed.

This patch changes the code to accept either result, and then to issue
a kfail as appropriate.