read-cache.c: remove 'const' from index_has_changes()

This function calls do_diff_cache() which eventually needs to set this "istate" to unpack_options->src_index [1]. This is an unfortunate fact that unpack_trees() _will_ update [2] src_index so we can't really pass a const index_state there. Just remove 'const'. [1] Right now diff_cache() in diff-lib.c assigns the_index to src_index. But the plan is to get rid of the_index, so it should be 'istate' from here that gets assigned to src_index. [2] Some transient bits in the source index are touched. Optional extensions can also be removed. But other than that the source tree should still be valid. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>