Add initial support for profile specific options

Not complete yet, we need to split option parsing for profiles a
bit.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/profile.h b/profile.h
index 6b19606..5268d4a 100644
--- a/profile.h
+++ b/profile.h
@@ -12,6 +12,7 @@
 	int flags;
 
 	const char **def_ops;
+	struct fio_option *options;
 };
 
 void register_profile(struct profile_ops *);