mysql-test/t/query_cache_sql_prepare.test : Prevent this test from running in "embedded".

mysql-test/t/query_cache_sql_prepare.test:
  Prevent this test from running in "embedded", it needs two connections.

mysql-test/t/query_cache_sql_prepare.test

@@ -4,6 +4,8 @@
 # Query cache is abbreviated as "QC"
 
 -- source include/have_query_cache.inc
+# embedded can't make more than one connection, which this test needs
+-- source include/not_embedded.inc
 
 connect (con1,127.0.0.1,root,,test,$MASTER_MYPORT,);
 connection default;