Update minimum required MySQL DBMS version

[sphery <mtdean@…>]

The attached patch updates the minimum required MySQL DBMS version to 5.0.15. [17160] removed some compatibility code required for MySQL versions 5.0.2 and below, so simply checking the major version is no longer sufficient. Since 5.0.15 was the first stable release of MySQL ( ​http://dev.mysql.com/doc/refman/5.0/en/roadmap.html : "The current production release series is MySQL 5.0, which was declared stable for production use as of MySQL 5.0.15, released in October 2005." ), it makes sense to require that version or greater. See, also, discussion in the thread at ​http://www.gossamer-threads.com/lists/mythtv/dev/332004#332004 .

The patch uses 3 defines--one each for major, minor, and point versions--as it was the easiest way to make the values work for both DBUtil::CompareDBMSVersion() and the error message.

The patch was created and tested on post-Qt4 trunk. Use the undocumented setting, 'DBMSVersionOverride', to test different MySQL versions (and feel free to put extra garbage in as it's possible in the wild--it works, though).

[sphery <mtdean@…>]

Updated patch for recent changes to trunk.

[sphery <mtdean@…>]

Updated patch to work with schemawizard

[sphery <mtdean@…>]

Added mythtv-5284-minimum_MySQL_version-20080729.patch to update the patch for use with post-schemawizard trunk. The patch simply changes the minimum DBMS version. It does not re-enable checking the DBMS version when not upgrading the DB. See also my comment in "Re: [mythtv-commits] mythtv commit: r17875 by nigel" thread on -dev for more info.

[Nigel]

(In [17975]) Update minimum required MySQL version to the first stable version, 5.0.15. Closes #5284 (with a slightly simpler version than Michael's patch).