Martin Hořeňovský b7b346c3e5
Make warnings in assertions fire for GCC/Clang again
The old code caused warnings to fire under MSVC, and Clang <3.8.
I could not find a GCC version where it worked, but I assume that it
did at some point.

This new code causes all of MSVC, GCC, Clang, in current versions,
to emit signed/unsigned comparison warning in test like this:

```cpp
TEST_CASE() {
    int32_t i = -1;
    uint32_t j = 1;
    REQUIRE(i != j);
}
```

Where previously only MSVC would emit the warning.

Fixes #1880
2020-03-19 09:45:41 +01:00
..
2019-10-04 14:19:39 +02:00
2019-04-27 18:50:05 +01:00
2020-01-25 09:01:04 +01:00
2020-02-08 14:27:40 +01:00