Fix for when shell version of mysql-test-run is called.

mysql-test/t/warnings-master.opt:
  Added skip-innodb option (which was what it once was...)
mysql-test/t/warnings.test:
  Removed un-needed variable setting. Bug only had to do with unterimated string.

mysql-test/t/warnings-master.opt

@@ -0,0 +1 @@
+--skip-innodb

mysql-test/t/warnings.test

@@ -150,8 +150,6 @@ drop table t1;
 # Bug#20778: strange characters in warning message 1366 when called in SP
 #
 
-let $engine_type= innodb;
-
 CREATE TABLE t1( f1 CHAR(20) );
 CREATE TABLE t2( f1 CHAR(20), f2 CHAR(25) );
 CREATE TABLE t3( f1 CHAR(20), f2 CHAR(25), f3 DATE );