Translate signal to C++ exception

[Kamil Rytarowski <n54%gmx.com@localhost>]

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I'm stuck with .Net porting to NetBSD, with the need to throw C++
exceptions from a signal handler (SIGSEGV).

I have found similar use-case in gcc/libjava and freebsd (dummy?) code
there. It was abstracted into a segvcatch library (wip/segvcatch).

I'm failing to make it work on NetBSD (release 7.0). This blocks me
from porting dotnet stack.

Thank you in advance,

I'm aware of the danger of this approach, for now I need to make it
just work. I cannot rewrite the dotnet code to use atomics etc.

For now all I need is to make segvcatch work on NetBSD.
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