loader: Convert reload_classes to built-in modules.

* acl (named_acl.c)
* cdr
* cel
* ccss
* dnsmgr
* dsp
* enum
* extconfig (config.c)
* features
* http
* indications
* logger
* manager
* plc
* sounds
* udptl

These modules are now loaded at appropriate time by the module loader.
Unlike loadable modules these use AST_MODULE_LOAD_FAILURE on error so
the module loader will abort startup on failure of these modules.

Some of these modules are still initialized or shutdown from outside the
module loader.  logger.c is initialized very early and shutdown very
late, manager.c is initialized by the module loader but is shutdown by
the Asterisk core (too much uses it without holding references).

Change-Id: I371a9a45064f20026c492623ea8062d02a1ab97f

main/Makefile

@@ -17,9 +17,9 @@ all: asterisk
 
 include $(ASTTOPDIR)/Makefile.moddir_rules
 
-# Can the MODSRC list be automated without needing built-in modules to be
-# in a different directory?  Would a different directory be better?
-MOD_SRC:=
+MOD_SRC:=cdr.c cel.c config.c ccss.c dnsmgr.c dsp.c enum.c features.c http.c indications.c logger.c manager.c named_acl.c plc.c sounds.c udptl.c
+# Allow deletion of built-in modules without needing to modify this source.
+MOD_SRC:=$(wildcard $(MOD_SRC))
 MOD_OBJS:=$(sort $(MOD_SRC:.c=.o))
 
 # Must include the extra ast_expr2.c, ast_expr2f.c, in case they need to be regenerated (because to force regeneration, we delete them)