Bug#33637 SHOW PROCEDURE CODE/SHOW FUNCTION CODE sp_name gives a syntax error.

Backport for 5.5

In non debug builds, the statements:
- SHOW PROCEDURE CODE
- SHOW FUNCTION CODE
used to fail with a "syntax error", which is misleading.

These statements have been changed to return the following error for non
debug builds:
ERROR HY000: The 'SHOW PROCEDURE|FUNCTION CODE' feature is disabled; you
need MySQL built with '--with-debug' to have it working

For debug builds (./configure --with-debug), nothing is changed.

mysql-test/include/have_nodebug.inc

@@ -0,0 +1,4 @@
+-- require r/have_nodebug.require
+disable_query_log;
+select (version() like '%debug%') as debug;
+enable_query_log;