Merge branch 'nd/const-struct-cache-entry'

* nd/const-struct-cache-entry:
Convert "struct cache_entry *" to "const ..." wherever possible

diff --cc builtin/apply.c
Simple merge

diff --cc builtin/checkout.c
Simple merge

diff --cc builtin/commit.c
Simple merge

diff --cc builtin/merge.c
Simple merge

diff --cc cache.h
Simple merge

diff --cc diff.c
Simple merge

diff --cc dir.c
Simple merge

diff --cc entry.c
Simple merge

diff --cc sha1_name.c
Simple merge

diff --cc submodule.c
Simple merge

diff --cc wt-status.c
Simple merge