Add compat handler for PTRACE_GETSIGINFO

[Christoph Hellwig]

On Sat, Apr 19, 2008 at 06:25:13PM +0200, Andreas Schwab wrote:
> Current versions of gdb require a working implementation of
> PTRACE_GETSIGINFO for proper watchpoint support.  Since struct siginfo
> contains pointers it must be converted when passed to a 32-bit debugger.

Roland just posted a patch to do this in generic code.