More fixes for ZIP_SUPPORT

- add extra commenting in FSNodeZIP concerning why another node is needed
- exclude zip files from the ROM launcher when ZIP_SUPPORT is disabled

src/common/FSNodeZIP.cxx

@@ -95,6 +95,11 @@ FilesystemNodeZIP::FilesystemNodeZIP(const string& p)
   else
     _isDirectory = true;
 
+  // Create a concrete FSNode to use
+  // This *must not* be a ZIP file; it must be a real FSNode object that
+  // has direct access to the actual filesystem (aka, a 'System' node)
+  // Behind the scenes, this node is actually a platform-specific object
+  // for whatever system we are running on
   _realNode = FilesystemNodeFactory::create(_zipFile, FilesystemNodeFactory::Type::SYSTEM);
 
   setFlags(_zipFile, _virtualPath, _realNode);

src/common/FSNodeZIP.hxx

@@ -93,7 +93,10 @@ class FilesystemNodeZIP : public AbstractFSNode
       NO_ROMS
     };
 
+    // Since a ZIP file is itself an abstraction, it still needs access to
+    // an actual concrete filesystem node
     AbstractFSNodePtr _realNode;
+
     string _zipFile, _virtualPath;
     string _name, _path, _shortPath;
     zip_error _error;

src/emucore/Bankswitch.cxx

@@ -137,7 +137,7 @@ Bankswitch::Description Bankswitch::BSList[int(Bankswitch::Type::NumSchemes)] =
   { "UA",       "UA (8K UA Ltd.)"               },
   { "WD",       "WD (Experimental)"             },
   { "X07",      "X07 (64K AtariAge)"            },
-#ifdef CUSTOM_ARM
+#if defined(CUSTOM_ARM)
   { "CUSTOM",   "CUSTOM (ARM)"                  }
 #endif
 };
@@ -149,11 +149,12 @@ Bankswitch::ExtensionMap Bankswitch::ourExtensions = {
   { "a26", Bankswitch::Type::_AUTO },
   { "bin", Bankswitch::Type::_AUTO },
   { "rom", Bankswitch::Type::_AUTO },
-  { "gz",  Bankswitch::Type::_AUTO },
+#if defined(ZIP_SUPPORT)
   { "zip", Bankswitch::Type::_AUTO },
+#endif
   { "cu",  Bankswitch::Type::_AUTO },
 
-  // All bankswitch types (tose that UnoCart and HarmonyCart support have the same name)
+  // All bankswitch types (those that UnoCart and HarmonyCart support have the same name)
   { "084", Bankswitch::Type::_0840   },
   { "2N1", Bankswitch::Type::_2IN1   },
   { "4N1", Bankswitch::Type::_4IN1   },