The Mysql module in Pike 8.0 does not handle an argument value
of UNDEFINED identically to as if the corresponding argument
was omitted.

Fixes list_{dbs,tables}() with omitted wild card argument.

Also fixes an obscure special case in list_fields().

Adds helper functions fix_{query,result}_charset() that contain
code that used to be in the QUERY_BODY() macro. This makes the
code quite a bit easier to read.

Adds charset wrappers to list_{dbs,tables,fields}() that previously
changed behavior depending on what the send_charset was.

Remove some now obsoleted character set handling from Mysql.SqlTable.

Potential fix for intermittent failures for Mysql.SqlTable to handle
tables with wide characters in the table name.

we can't assume that because the send buffer is empty, no more data
can be expected. should still identify problems, as test will either
succeed or fail by the backend countdown timing out.

back ported from main SSL testsuite.

* patches/gtk2-main_iteration:
  GTK2: Fixed a few more uses of g_main_iteration().

glib 2.36 deprecated some stuff that the gtk-2 headerfiles use.
So set GLIB_VERSION_MIN_REQUIRED to a version prior to
GLIB_VERSION_2_36 to inhibit the deprecation warnings.

Fixes some deprecation warnings.

* patches/mariadb-conc-509:
  Configure [Mysql]: Survive MariaDB Connector/C 3.2.1 and later (CONC-509).

MariaDB Connector/C 3.2.1 CONC-509 changed the value returned
from mysql_get_client_version(3) from MYSQL_VERSION_ID to
MARIADB_PACKAGE_VERSION_ID.

Fixes support for MariaDB from 2021-05-31 and later.