glsl: fix gl_CullDistance xfb linking
this matches the behavior for gl_ClipDistance
fixes #7152 (closed)
Fixes: 0c8492cd ("glsl: fix location for array subscript")
Edited by Mike Blumenkrantz
this matches the behavior for gl_ClipDistance
fixes #7152 (closed)
Fixes: 0c8492cd ("glsl: fix location for array subscript")