[Bug c/87310] -Wc90-c99-compat does not warn about bool usage

[kohanyi.robert at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87310

--- Comment #1 from Róbert Kohányi <kohanyi.robert at gmail dot com> ---
Created attachment 44695
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44695&action=edit
a.c preprocessed version