Have gdb.ThreadExitedEvent inherit from gdb.ThreadEvent

The documentation says that ThreadExitedEvent is derived from
ThreadEvent, but the code does not actually implement this.

This patch fixes the problem.  I propose applying this to gdb 17 as
well.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33444
Approved-By: Simon Marchi <simon.marchi@efficios.com>


2 files changed