Doctest SEH handlers are called before __except handlers

[jkriegshauser]

Description

Doctest will report exceptions even if code exists that uses Windows __try/__except Structured-Exception Handlers.

Steps to reproduce

This test case will report a SIGSEGV even though the crash is handled by SEH:

#ifdef _MSC_VER
static void NoCrash()
{
    __try
    {
        int* p = 0;
        *p = 1;
    }
    __except (1)
    {
        // Caught!
    }
}

TEST_CASE("SEH Avoided Crash")
{
    NoCrash();
    CHECK(1);
}
#endif

Extra information

• doctest version: v2.3.6
• Operating System: Windows 10 x64
• Compiler+version: MS Visual Studio 2017

[TheQwertiest]

@onqtam , shouldn't be this issue closed, since #325 fixed it?

[onqtam]

@TheQwertiest It's being kept open since it's still not pushed to master (only in dev)