graphics/glew: drop unused dependencies after 0ccfc073ab99
- -lGLU dropped in https://github.com/nigels-com/glew/commit/3828cfb38c7b
- -lXmu -lXi -lXext dropped in https://github.com/nigels-com/glew/commit/d03b68e40d00
PR: 257626
Approved by: maintainer timeout (3 weeks)