emacs: add glsl-mode config

emacs/auto/-packages.el

@@ -25,11 +25,15 @@
   ((rust-mode-indent-line . rust-indent-offset)))
 (smart-tabs-add-language-support fish fish-mode-hook
   ((fish-indent-line . fish-indent-offset)))
+(smart-tabs-add-language-support glsl glsl-mode-hook
+  ((c-indent-line . c-basic-offset)
+   (c-indent-region . c-basic-offset)))
 (smart-tabs-insinuate
  'c
  'fish
  'javascript
- 'rust)
+ 'rust
+ 'glsl)
 
 (require 'ranger)