tcl_tests: Make utf-8 encoding work

tcl_tests: Make utf-8 encoding work

- Remove emacs coding: cp1251 tag
- Change stats file encoding to utf-8
- Change packages source to have -encoding utf-8
- Run tclsh with -encoding utf-8
- Make `proc rus' noop.

This will make Tcl automatically translate scripts output from utf-8 to
system encoding.