Merge pull request #8708 from richardkchapman/mysql_50

HPCC-15622 MySQLEMBED build (candidate-6.0.0) fails on CentOS 5

Reviewed-By: Xiaoming Wang <xiaoming.wang@lexisnexis.com>

plugins/mysql/mysqlembed.cpp

@@ -1200,19 +1200,19 @@ public:
                             case ParamTypeUInt:
                                 {
                                     unsigned int oval = strtoul(val, nullptr, 10);
-                                    rc = mysql_options(*conn, optDef.option, &oval);
+                                    rc = mysql_options(*conn, optDef.option, (const char *) &oval);
                                     break;
                                 }
                             case ParamTypeULong:
                                 {
                                     unsigned long oval = strtoul(val, nullptr, 10);
-                                    rc = mysql_options(*conn, optDef.option, &oval);
+                                    rc = mysql_options(*conn, optDef.option, (const char *) &oval);
                                     break;
                                 }
                             case ParamTypeBool:
                                 {
                                     my_bool oval = clipStrToBool(val);
-                                    rc = mysql_options(*conn, optDef.option, &oval);
+                                    rc = mysql_options(*conn, optDef.option, (const char *) &oval);
                                     break;
                                 }
                             }