Fix #11560: ADOdb version check in check.php is incorrect

See upstream bug report
http://phplens.com/lens/lensforum/msgs.php?id=18320 for the reason as to
why this change is necessary. version_compare works with strings, not
float values. And the Version() function in ADOdb should not be
returning floats anyway (there is no way to determine if the version if
5.1 or 5.10 from a float value).

admin/check.php

@@ -261,7 +261,15 @@ function test_database_utf8() {
 	print_info_row( 'Database is not connected - Can not continue checks' );
 }
 
-print_test_warn_row( 'Checking adodb version...', version_compare( $g_db->Version(), '5.05', '>=' ), $g_db->Version() );
+if( isset( $ADODB_vers ) ) {
+	# ADOConnection::Version() is broken as it treats v5.1 the same as v5.10
+	# Therefore we must extract the correct version ourselves
+	# Upstream bug report: http://phplens.com/lens/lensforum/msgs.php?id=18320
+	if( preg_match( '/^[Vv]([0-9\.]+)/', $ADODB_vers, $t_matches ) == 1 ) {
+		$t_adodb_version_check_ok = version_compare( $t_matches[1], '5.10', '>=' );
+	}
+}
+print_test_warn_row( 'Checking adodb version...', $t_adodb_version_check_ok, $ADODB_vers );
 
 print_test_row('Checking using bundled adodb with some drivers...', !(db_is_pgsql() || db_is_mssql() || db_is_db2()) || strstr($ADODB_vers, 'MantisBT Version') !== false );
 $t_serverinfo = $g_db->ServerInfo();