Change stolen from the -win tree.

More specifically, the scripts/Makefile isn't created and it doesn't
translate mysql_fix_privilege_tables ".sh" .  So, 
mysql-test/mysql-test-run.pl doesn't find the binary and substitutes 
/bin/false instead.  That obviously doesn't "fix" anything and the 
test fails because of it.


mysql-test/t/system_mysql_db_fix.test:
  Change stolen from the -win tree.

mysql-test/t/system_mysql_db_fix.test

 # Embedded server doesn't support external clients
 --source include/not_embedded.inc
 
+# Windows doesn't support execution of shell scripts (to fix!!)
+--source include/not_windows.inc
+
 # check that CSV engine was compiled in, as the test relies on the presence
 # of the log tables (which are CSV-based)
 --source include/have_csv.inc