pty: reset signal-handlers for childs

If signal-handlers are set to SIG_IGN, then this behavior is preserved
across an execve(). We don't want that so reset the handlers for all
childs before executing them.

kmscon may be executed with pre-set signal handlers for good reasons. So
reset the handlers in setup_child() so we have a clean environment.

This fixes a bug where child-programs assume SIGPIPE is not ignored but do
not explicitly set it to SIG_DFL.

Reported-by: Swift Geek [github issue #62]
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

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