glsl: remove unused link_assign_uniform_block_offsets

ubo offsets are assigned by link_uniform_blocks since 514f8c7e

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/glsl/linker.h

@@ -50,9 +50,6 @@ link_cross_validate_uniform_block(void *mem_ctx,
 				  unsigned int *num_linked_blocks,
 				  struct gl_uniform_block *new_block);
 
-void
-link_assign_uniform_block_offsets(struct gl_shader *shader);
-
 extern bool
 link_uniform_blocks_are_compatible(const gl_uniform_block *a,
 				   const gl_uniform_block *b);