* root.h: Added "fluids" member to scm_root_state.

* root.c: Include "fluids.h".  (scm_mark_root): Mark "fluids".
(scm_make_root): Call scm_copy_fluids to make fluid bindings
unique for the new root when it has a parent.

libguile/root.h

@@ -98,7 +98,7 @@ typedef struct scm_root_state
   /* It is very inefficient to have this variable in the root state. */
   scm_debug_frame *last_debug_frame;
 #endif
-  
+
   SCM progargs;			/* vestigial */
   SCM exitval;			/* vestigial */
 
@@ -109,6 +109,8 @@ typedef struct scm_root_state
   SCM def_outp;
   SCM def_errp;
 
+  SCM fluids;
+
   SCM system_transformer;
   SCM top_level_lookup_closure_var;