[Bug gdb/18945] gdbserver cannot be interrupted on linux when pgid doesn't match pid

["xdje42 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18945

--- Comment #3 from Doug Evans <xdje42 at gmail dot com> ---
Ah, so what we need to do is have gdbserver track inferior process groups.
[if one wants to keep the current scheme of sending SIGINT to the process
group,
which would be nice, though it's not clear that's the only or best solution
here.
I can also imagine preferring different solutions at different times, which gdb
itself is already doing.]

Still, the attached patch suffers from the issue that the current code tries to
avoid. As a local patch, maybe it's ok to trade one set of issues for another.

I also notice that gdb is using set_sigint_trap + pass_signal (trunk,
amd64-linux) when attached to an inferior, and this also doesn't send SIGINT to
the pgrp (setting aside the "interrupt" command, which uses
linux_nat_interrupt).

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