panfrost, glsl: Simplify varying linking
First four patches are from !6163 (closed) - that MR correctly handles linking precision of XFB varyings, while this one focuses on component count.
Cc @lfrb
First four patches are from !6163 (closed) - that MR correctly handles linking precision of XFB varyings, while this one focuses on component count.
Cc @lfrb