don't install runPythonEmacs on Linux

direct/src/directscripts/Sources.pp

@@ -1,7 +1,7 @@
-#if $[CTPROJS]
-  // This script is only useful if you're using the ctattach scripts;
-  // therefore, we only bother to install it if you're using the
-  // cattach scripts.
+#if $[and $[CTPROJS],$[WINDOWS_PLATFORM]]
+  // This script is only useful if you're using the ctattach script on
+  // Windows; therefore, we only bother to install it if you're using
+  // the cattach scripts.
   #define INSTALL_SCRIPTS runPythonEmacs
 
 #endif