Fix up a mistake in antispam logic where only the user, not any other residents might be blocked.

Adds can_block() to NACLantispam.cpp to unify the blocking checks, so mistakes like this shouldn't happen again.
Best viewed without space changes.

indra/newview/llviewercontrol.cpp

@@ -85,7 +85,6 @@
 #include "aicurl.h"
 #include "aihttptimeoutpolicy.h"
 
-#include "NACLantispam.h"    // for NaCl Antispam Registry
 
 #ifdef TOGGLE_HACKED_GODLIKE_VIEWER
 BOOL 				gHackGodmode = FALSE;