fix embedded build and warning

sql/sql_class.cc

@@ -749,7 +749,6 @@ THD::THD()
    derived_tables_processing(FALSE),
    spcont(NULL),
    m_parser_state(NULL),
-   skip_wait_timeout(false),
 #if defined(ENABLED_DEBUG_SYNC)
    debug_sync_control(0),
 #endif /* defined(ENABLED_DEBUG_SYNC) */
@@ -769,6 +768,7 @@ THD::THD()
   scheduler= thread_scheduler;                 // Will be fixed later
   event_scheduler.data= 0;
   event_scheduler.m_psi= 0;
+  skip_wait_timeout= false;
   extra_port= 0;
   catalog= (char*)"std"; // the only catalog we have for now
   main_security_ctx.init();

sql/sys_vars.cc

@@ -2186,7 +2186,7 @@ static Sys_var_ulong Sys_thread_cache_size(
        GLOBAL_VAR(thread_cache_size), CMD_LINE(REQUIRED_ARG),
        VALID_RANGE(0, 16384), DEFAULT(0), BLOCK_SIZE(1));
 
-
+#ifdef HAVE_POOL_OF_THREADS
 static bool fix_tp_max_threads(sys_var *, THD *, enum_var_type)
 {
 #ifdef _WIN32
@@ -2257,7 +2257,7 @@ static Sys_var_uint Sys_threadpool_max_threads(
    NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0), 
    ON_UPDATE(fix_tp_max_threads)
 );
-
+#endif /* HAVE_POOL_OF_THREADS */
 
 /**
   Can't change the 'next' tx_isolation if we are already in a