most uses of scm_from_locale_symbol become scm_from_utf8_symbol

* libguile/array-handle.c:
* libguile/chars.c:
* libguile/expand.c:
* libguile/feature.c:
* libguile/goops.c:
* libguile/gsubr.c:
* libguile/instructions.c:
* libguile/load.c:
* libguile/macros.c:
* libguile/memoize.c:
* libguile/modules.c:
* libguile/options.c:
* libguile/print.c:
* libguile/smob.c:
* libguile/snarf.h: Change most uses of scm_from_locale_symbol to
  scm_from_utf8_symbol, as the symbols really are not locale-dependent.

libguile/memoize.c

@@ -618,7 +618,7 @@ unmemoize_lexical (SCM n)
   char buf[16];
   buf[15] = 0;
   snprintf (buf, 15, "<%u>", scm_to_uint32 (n));
-  return scm_from_locale_symbol (buf);
+  return scm_from_utf8_symbol (buf);
 }
 
 static SCM