Fix DB locking issue on MySQL 5.5

affecting DB initialization.  This is the DB init equivalent of
0bc768e (and its backported version at 4ef6458 ).

Thanks to JYA for finding the issue.
(cherry picked from commit c419275)

mythtv/libs/libmythtv/dbcheck.cpp

@@ -5553,12 +5553,7 @@ bool InitializeMythSchema(void)
 
     VERBOSE(VB_IMPORTANT, "Inserting MythTV initial database information.");
 
-    QString qtmp = QString("ALTER DATABASE %1 DEFAULT CHARACTER SET utf8;")
-        .arg(gCoreContext->GetDatabaseParams().dbName);
-    QByteArray tmp = qtmp.toAscii();
-
     const char *updates[] = {
-tmp.constData(),
 "CREATE TABLE callsignnetworkmap ("
 "  id int(11) NOT NULL AUTO_INCREMENT,"
 "  callsign varchar(20) NOT NULL default '',"