WL#5030: Splitting mysql_priv.h

Adding my_global.h first in all files using
NO_EMBEDDED_ACCESS_CHECKS.

Correcting a merge problem resulting from a changed definition
of check_some_access compared to the original patches.

sql/sql_class.cc

@@ -25,6 +25,7 @@
 #pragma implementation				// gcc: Class implementation
 #endif
 
+#include "my_global.h"                          /* NO_EMBEDDED_ACCESS_CHECKS */
 #include "sql_priv.h"
 #include "unireg.h"                    // REQUIRED: for other includes
 #include "sql_class.h"