remove old soft2egg reference

dtool/pptempl/Global.pp

@@ -71,8 +71,10 @@
 #if $[HAVE_SOFTIMAGE]
   #define SOFT2EGG soft -D libsoftegg soft2egg
 #else
-  // Temporary: use the old converter from pre-Panda days.
-  #define SOFT2EGG soft2egg
+  // We used to use the old converter from pre-Panda days.  Now this
+  // is no longer supported.
+  //  #define SOFT2EGG soft2egg
+  #define SOFT2EGG soft -D libsoftegg soft2egg
 #endif
 
 // Define some various compile flags, derived from the variables set