directory to search gdb directory. Accept and step over conditional
stack alignment code. Consume $prompt in failure cases.
Reset timeout to $oldtimeout instead of some arbitrary value.
* gdb.base/nodebug.exp: Limit backtrace to 10 frames to avoid
timeout problems with infinite stack backtraces.
* gdb.base/ptype.exp (ptype struct link, union tu_link):
Accept function parameters for linkfunc member.