New API function iso_init_with_flag().

Moved setup of locale from various places to util.c:iso_init_locale().
It is now called by the iso_init*() functions only.

libisofs/ecma119.c

@@ -954,11 +954,13 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
     target->eltorito = (src->bootcat == NULL ? 0 : 1);
     target->catalog = src->bootcat;
 
+#ifdef Libisofs_setlocale_in_iniT
     /* default to locale charset */
     /* ??? ts Nov 25 2008 :
        Shouldn't this go to library initialization or even to app ?
     */
     setlocale(LC_CTYPE, "");
+#endif
 
     target->input_charset = strdup(iso_get_local_charset(0));