See #2202

Note that only documentation and comments are impacted by this change.

The `Catch2WithMain` target was added experimentally for v2.13.4
to provide potentially better compilation (and link) times to users.
However, having it compiled by default causes worse experience for
people who do not use it, and for the v2 versions the single include
distribution is still the main one.

Closes #2142

Because new glibc has changed `MINSIGSTKSZ` to be a syscall instead
of being constant, the signal posix handling needed changes, as it
used the value in constexpr context, for deciding size of an array.
It would be simple to fix it by having the handler determine the
signal handling stack size and allocate the memory every time the
handler is being installed, but that would add another allocation
and a syscall every time a test case is entered.

Instead, I split apart the idea of preparing fatal error handlers,
and engaging them, so that the memory can be allocated only once
and still be guarded by RAII.

Also turns out that Catch2's use of `MINSIGSTKSZ` was wrong, and
we should've been using `SIGSTKSZ` the whole time, which we use now.

Closes #2178

* [Issue 2154] Correct error when building with IBM's latest XLC compiler with xlclang++ front-end.

On AIX, the XLC 16.1.0.1 compiler considers the call to `std::abs` ambigious, so it needs help with a static_cast to the type of the template argument.

Co-authored-by: Martin Hořeňovský <martin.horenovsky@gmail.com>

Making target detection on Mac more robust