Add a destructor to windows_thread_info that calls CloseHandle.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* nat/windows-nat.h (struct windows_thread_info): Declare
destructor.
* nat/windows-nat.c (~windows_thread_info): New.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (delete_thread_info): Don't call CloseHandle.