* src/misc/httpd.c: Changed the encoding of mandatory pages (401, 403, 404...)

 * src/misc/httpd.c: Changed the encoding of mandatory pages (401, 403, 404...)
   to ascii instead of UTF-8 because those pages actually contain only
   ascii characters, and it allows it to work with all browsers including
   those which do not support UTF-8. BTW these pages should be somewhere
   in the filesystem instead of hard-coded in the C file.