Get sdktools and sdkhooks/dhooks to load on hl2sdk-mock (#1892)

* Build SDKTools for hl2sdk-mock

* Fix loading of extensions using advanced naming scheme for hl2sdk-mock

* Fix error on missing sv_visiblemaxplayers convar

* Build SDKHooks for hl2sdk-mock

* Fix x86_64 SourcePawn VM filename

* SDKHooks: Ignore missing IEntityListeners list in hl2sdk-mock

core/logic_bridge.cpp

@@ -375,6 +375,8 @@ void UTIL_ConsolePrint(const char *fmt, ...)
 #define GAMEFIX "2.pvkii"
 #elif SOURCE_ENGINE == SE_MCV
 #define GAMEFIX "2.mcv"
+#elif SOURCE_ENGINE == SE_MOCK
+#define GAMEFIX "2.mock"
 #else
 #define GAMEFIX "2.ep1"
 #endif