[PATCH][gdb/testsuite] Fix xpass in gdb.python/lib-types.exp

[Tom Tromey]

>>>>> "Tom" == Tom de Vries <tdevries@suse.de> writes:

Tom> It's incorrect to xfail a gdb test-case for gcc bug.

I think we've used "kfail" for this in the past, though TBH I never
truly understood the kfail/xfail distinction and I probably have it
backward or something.

Tom> 2020-02-19  Tom de Vries  <tdevries@suse.de>

Tom> 	* gdb.python/lib-types.exp: Remove gcc/55641 xfail.

This is ok.  Thank you.

Tom