Float NAN values yield wrong result when cast to bool or as controlling expression

[fuhsnn]

#include <stdio.h>

int main(void) {
    printf("%d\n", (_Bool)(0.0/0.0)); // expect 1, got 0
    printf("%d\n", (0.0/0.0) ? 1 : 0); // expect 1, got 0
}

[fuhsnn]

Fixed with https://github.com/fuhsnn/widcc/commit/d8981c320d55dc9acbc5f1f7c395def51987ec38