[Libguestfs] [PATCH libnbd v2 0/3] Use GNUTLS_NO_SIGNAL if available

V1 was here: https://listman.redhat.com/archives/libguestfs/2022-July/029545.html The original second patch is now upstream. As well as updating 1/3 with the feedback, I added two new patches. This has been compile tested on FreeBSD and doesn't seem to break anything, but testing if it correctly suppresses SIGPIPE on FreeBSD is tricky. Rich.