[Bug c/51712] -Wtype-limits should not trigger for types of implementation-defined signedness

[jrnieder at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51712

--- Comment #18 from Jonathan Nieder <jrnieder at gmail dot com> ---
That said, as mentioned in comment#15, the use of -fno-short-enums in the test
is not right. I'll try removing that and see if the test still passes tomorrow
(it should).