Re: [PATCH v2 05/13] hooks: convert 'post-checkout' hook to hook library

Move the running of the 'post-checkout' hook away from run-command.h
to the new hook.h library. For "worktree" this requires a change to it
to run the hooks from a given directory.

We could strictly speaking skip the "absolute_path" flag and just
check if "dir" is specified, but let's split them up for clarity, as
well as for any future user who'd like to set "dir" but not implicitly
change the argument to an absolute path.

Signed-off-by: Emily Shaffer <redacted>
Signed-off-by: Ævar Arnfjörð Bjarmason <redacted>

--- a/read-cache.c
+++ b/read-cache.c

@@ -28,6 +28,7 @@
 #include "sparse-index.h"
 #include "csum-file.h"
 #include "promisor-remote.h"
+#include "hook.h"