client: Remove uses of Autohook from rejectconnectionfixes.cpp (#793)

Removes AUTOHOOK macro from `rejectconnectionfixes.cpp`.

primedev/client/rejectconnectionfixes.cpp

@@ -1,12 +1,8 @@
 #include "engine/r2engine.h"
 
-AUTOHOOK_INIT()
-
 // this is called from  when our connection is rejected, this is the only case we're hooking this for
-// clang-format off
-AUTOHOOK(COM_ExplainDisconnection, engine.dll + 0x1342F0,
-void,, (bool a1, const char* fmt, ...))
-// clang-format on
+static void (*o_pCOM_ExplainDisconnection)(bool a1, const char* fmt, ...) = nullptr;
+static void h_COM_ExplainDisconnection(bool a1, const char* fmt, ...)
 {
 	va_list va;
 	va_start(va, fmt);
@@ -25,10 +21,11 @@ void,, (bool a1, const char* fmt, ...))
 		Cbuf_AddText(Cbuf_GetCurrentPlayer(), "disconnect", cmd_source_t::kCommandSrcCode);
 	}
 
-	return COM_ExplainDisconnection(a1, "%s", buf);
+	return o_pCOM_ExplainDisconnection(a1, "%s", buf);
 }
 
 ON_DLL_LOAD_CLIENT("engine.dll", RejectConnectionFixes, (CModule module))
 {
-	AUTOHOOK_DISPATCH()
+	o_pCOM_ExplainDisconnection = module.Offset(0x1342F0).RCast<decltype(o_pCOM_ExplainDisconnection)>();
+	HookAttach(&(PVOID&)o_pCOM_ExplainDisconnection, (PVOID)h_COM_ExplainDisconnection);
 }