separate Jim from jtag/core.c

After previous efforts, only one Jim routine remained in jtag/core.c,
and moving it to jtag/tcl.c painlessly finishes separating these layers.
The headers need separating, but the implementation is clean.

src/jtag/core.c

@@ -244,17 +244,6 @@ struct jtag_tap *jtag_tap_by_string(const char *s)
 	return t;
 }
 
-struct jtag_tap *jtag_tap_by_jim_obj(Jim_Interp *interp, Jim_Obj *o)
-{
-	const char *cp = Jim_GetString(o, NULL);
-	struct jtag_tap *t = cp ? jtag_tap_by_string(cp) : NULL;
-	if (NULL == cp)
-		cp = "(unknown)";
-	if (NULL == t)
-		Jim_SetResult_sprintf(interp, "Tap '%s' could not be found", cp);
-	return t;
-}
-
 struct jtag_tap* jtag_tap_next_enabled(struct jtag_tap* p)
 {
 	p = p ? p->next_tap : jtag_all_taps();

src/jtag/tcl.c

@@ -51,6 +51,17 @@ static const Jim_Nvp nvp_jtag_tap_event[] = {
 
 extern struct jtag_interface *jtag_interface;
 
+struct jtag_tap *jtag_tap_by_jim_obj(Jim_Interp *interp, Jim_Obj *o)
+{
+	const char *cp = Jim_GetString(o, NULL);
+	struct jtag_tap *t = cp ? jtag_tap_by_string(cp) : NULL;
+	if (NULL == cp)
+		cp = "(unknown)";
+	if (NULL == t)
+		Jim_SetResult_sprintf(interp, "Tap '%s' could not be found", cp);
+	return t;
+}
+
 static bool scan_is_safe(tap_state_t state)
 {
 	switch (state)