optional_api: Remove unused nonoptreq fields

As they're not actively used, they only grow stale. The moduleinfo field itself
is kept in Asterisk 13/15 for ABI compatibility.

ASTERISK-28046 #close

Change-Id: I8df66a7007f807840414bb348511a8c14c05a9fc

res/ari/ari_model_validators.h

@@ -23,11 +23,10 @@
  * the validator's function pointer.
  *
  * The reason for this seamingly useless indirection is the way function
- * pointers interfere with module loading. Asterisk attempts to dlopen() each
- * module using \c RTLD_LAZY in order to read some metadata from the module.
- * Unfortunately, if you take the address of a function, the function has to be
- * resolvable at load time, even if \c RTLD_LAZY is specified. By moving the
- * function-address-taking into this module, we can once again be lazy.
+ * pointers used to interfere with module loading. Previously, Asterisk
+ * attempted to dlopen() each module using \c RTLD_LAZY in order to read some
+ * metadata from the module. Using functions to get the function pointer
+ * allowed us to be lazy.
  */
 
  /*

res/res_stasis_test.c

@@ -100,23 +100,10 @@ struct stasis_message_sink *stasis_message_sink_create(void)
  * \brief Implementation of the stasis_message_sink_cb() callback.
  *
  * Why the roundabout way of exposing this via stasis_message_sink_cb()? Well,
- * it has to do with how we load modules.
+ * it has to do with how we previously loaded modules, using \c RTLD_LAZY.
  *
- * Modules have their own metadata compiled into them in the module info block
- * at the end of the file.  This includes dependency information in the
- * \c nonoptreq field.
- *
- * Asterisk loads the module, inspects the field, then loads any needed
- * dependencies. This works because Asterisk passes \c RTLD_LAZY to the initial
- * dlopen(), which defers binding function references until they are called.
- *
- * But when you take the address of a function, that function needs to be
- * available at load time. So if some module used the address of
- * message_sink_cb() directly, and \c res_stasis_test.so wasn't loaded yet, then
- * that module would fail to load.
- *
- * The stasis_message_sink_cb() function gives us a layer of indirection so that
- * the initial lazy binding will still work as expected.
+ * The stasis_message_sink_cb() function gave us a layer of indirection so that
+ * the initial lazy binding would still work as expected.
  */
 static void message_sink_cb(void *data, struct stasis_subscription *sub,
 	struct stasis_message *message)

rest-api-templates/ari_model_validators.h.mustache

@@ -23,11 +23,10 @@
  * the validator's function pointer.
  *
  * The reason for this seamingly useless indirection is the way function
- * pointers interfere with module loading. Asterisk attempts to dlopen() each
- * module using \c RTLD_LAZY in order to read some metadata from the module.
- * Unfortunately, if you take the address of a function, the function has to be
- * resolvable at load time, even if \c RTLD_LAZY is specified. By moving the
- * function-address-taking into this module, we can once again be lazy.
+ * pointers used to interfere with module loading. Previously, Asterisk
+ * attempted to dlopen() each module using \c RTLD_LAZY in order to read some
+ * metadata from the module. Using functions to get the function pointer
+ * allowed us to be lazy.
  */
 
  /*

tests/test_ari_model.c

@@ -40,8 +40,8 @@
 /*!
  * Wrapper of ast_test_validate_int() so an external function pointer is not used.
  *
- * \note Must do this because using an external function pointer
- * does not play nicely when loading with RTLD_LAZY.
+ * \note We do this because using an external function pointer
+ * did not play nicely when we loaded with RTLD_LAZY.
  */
 static int wrap_ast_ari_validate_int(struct ast_json *json)
 {
@@ -53,8 +53,8 @@ static int wrap_ast_ari_validate_int(struct ast_json *json)
 /*!
  * Wrapper of ast_ari_validate_string() so an external function pointer is not used.
  *
- * \note Must do this because using an external function pointer
- * does not play nicely when loading with RTLD_LAZY.
+ * \note We do this because using an external function pointer
+ * did not play nicely when we loaded with RTLD_LAZY.
  */
 static int wrap_ast_ari_validate_string(struct ast_json *json)
 {