modules_s: include sr_module.h

- some modules updated to include sr_module.h as they need access to
  fparam_t
- previously that was inherited from modules_s/sl/sl_funcs.h which was
  included by modules_s/sl/sl.h
- modules_s/sl/sl.h became simple API definition being included by
  modules_k/sl/sl.h in order to export same API in K version

modules_s/auth_db/authorize.c

@@ -49,6 +49,7 @@
 #include "../../mem/mem.h"
 #include "../../config.h"
 #include "../../id.h"
+#include "../../sr_module.h"
 #include "../auth/api.h"
 #include "authdb_mod.h"
 

modules_s/registrar/lookup.c

@@ -44,6 +44,7 @@
 #include "../usrloc/usrloc.h"
 #include "../../error.h"
 #include "../../id.h"
+#include "../../sr_module.h"
 #include "common.h"
 #include "regtime.h"
 #include "reg_mod.h"

modules_s/registrar/save.c

@@ -46,6 +46,7 @@
 #include "../../qvalue.h"
 #include "../../id.h"
 #include "../../globals.h"
+#include "../../sr_module.h"
 #include "common.h"
 #include "sip_msg.h"
 #include "rerrno.h"