Merge tag 'misc-fixes-pull-request' of https://gitlab.com/berrange/qemu into staging

Crypto patches

* Drop unused 'detached-header' QAPI field from LUKS create options
* Improve tracing of TLS sockets and TLS chardevs
* Improve error messages from TLS I/O failures
* Add docs about use of LUKS detached header options
* Allow building without libtasn1, but with GNUTLS
* Fix detection of libgcrypt when libgcrypt-config is absent

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# gpg:                using RSA key DAF3A6FDB26B62912D0E8E3FBE86EBB415104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>" [full]
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>" [full]

* tag 'misc-fixes-pull-request' of https://gitlab.com/berrange/qemu:
  crypto: propagate errors from TLS session I/O callbacks
  crypto: push error reporting into TLS session I/O APIs
  crypto: drop gnutls debug logging support
  chardev: add tracing of socket error conditions
  meson: build chardev trace files when have_block
  qapi: drop unused QCryptoBlockCreateOptionsLUKS.detached-header
  meson.build: fix libgcrypt detection on system without libgcrypt-config
  docs/devel: Add introduction to LUKS volume with detached header
  crypto: Allow building with GnuTLS but without Libtasn1
  crypto: Restrict pkix_asn1_tab[] to crypto-tls-x509-helpers.c
  crypto: Remove 'crypto-tls-x509-helpers.h' from crypto-tls-psk-helpers.c

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>