voicemail: Move app_voicemail / res_mwi_external conflict to runtime

The menuselect conflict between app_voicemail and res_mwi_external
makes it hard to package 1 version of Asterisk.  There no actual
build dependencies between the 2 so moving this check to runtime
seems like a better solution.

The ast_vm_register and ast_vm_greeter_register functions in app.c
were modified to return AST_MODULE_LOAD_DECLINE instead of -1 if there
is already a voicemail module registered. The modules' load_module
functions were then modified to return DECLINE instead of -1 to the
loader.  Since -1 is interpreted by the loader as AST_MODULE_LOAD_FAILURE,
the modules were incorrectly causing Asterisk to stop so this needed
to be cleaned up anyway.

Now you can build both and use modules.conf to decide which voicemail
implementation to load.

The default menuselect options still build app_voicemail and not
res_mwi_external but if both ARE built, res_mwi_external will load
first and become the voicemail provider unless modules.conf rules
prevent it.  This is noted in CHANGES.

Change-Id: I7d98d4e8a3b87b8df9e51c2608f0da6ddfb89247

1 files changed, 2 insertions, 2 deletions

diff --git a/main/app.c b/main/app.c
index 8c33b9146..c4143d840 100644
--- a/main/app.c
+++ b/main/app.c
@@ -494,7 +494,7 @@ int __ast_vm_register(const struct ast_vm_functions *vm_table, struct ast_module
 	if (table) {
 		ast_log(LOG_WARNING, "Voicemail provider already registered by %s.\n",
 			table->module_name);
-		return -1;
+		return AST_MODULE_LOAD_DECLINE;
 	}
 
 	table = ao2_alloc_options(sizeof(*table), NULL, AO2_ALLOC_OPT_LOCK_NOLOCK);
@@ -605,7 +605,7 @@ int __ast_vm_greeter_register(const struct ast_vm_greeter_functions *vm_table, s
 	if (table) {
 		ast_log(LOG_WARNING, "Voicemail greeter provider already registered by %s.\n",
 			table->module_name);
-		return -1;
+		return AST_MODULE_LOAD_DECLINE;
 	}
 
 	table = ao2_alloc_options(sizeof(*table), NULL, AO2_ALLOC_OPT_LOCK_NOLOCK);