emacs: force latex-mode for .tex files
emacs: force latex-mode for .tex files

Apparently Emacs guesses a .tex file as either tex-mode, latex-mode,
doctex-mode, or slitex-mode. This guessing behavior is not accurate
(hence, useless), so make Emacs always start with the same default
(LaTeX mode).

listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg