Gwenhywfar

OS: Started implementing GWEN_Thread

This will probably first be used in AqDatabase.

Incremented version.

SIO: Added call to gnutls_server_name_set(), should enable SNI.

Setting the server name should enable SNI extension in GnuTLS according
to the GnuTLS APIDOC.

If this extension is not available (or hostnam not set) then the resulting
error is ignored for now. The result of this will be a warning from GnuTLS...

Export mutex functions.

Typemaker2: Added getters for virtual functions.

Merge branch 'rel-5.4.1' into maint

Merge branch 'rel-5.4.1'

Prepared release 5.4.1.

BUILD: Removed missing file.

Merge remote-tracking branch 'origin/rework_ssl_m4'

Switch to pkg-config for detecting OpenSSL properties

Drop unused $(ssl_includes) from tools/gsa/ CPPFLAGS

Cleanup unused autoconf variables GWEN_CRYPTO and USE_CRYPT

Drop $ssl_libraries and $ssl_lib from PROG_LIBRARIES

The only code that makes use of OpenSSL is in gcttool, and this makes use of
$ssl_libraries and $ssl_lib directly.

Merge branch 'rel-5.4.0'

Prepared release 5.4.0.

Merge branch 'rel-5.4.0' into maint

Prepared release 5.4.0.

Prepared release 5.4.0.

Fixed a compiler warning.

Increased version.

Merge branch 'mp-202004-with_libxml'

TEST: Added another test for pss.

XMLCMD: Also check for empty string in _dbIfNotHasCharData()

- also fixed some typos

BUILD: Add libxml2 libs.

typemaker2: Fixed a bug in int_array description.

os: Use read/write instead of recv/send for non-sockets.