[PATCH v2 1/2] ntdll: Unify get_file_info and fd_get_file_info.

[Erich E. Hoover]

get_file_info and fd_get_file_info duplicate the same logic except
that they either work on paths or file descriptors (respectively).
This patch consolidates these two routines and moves some of the
path-specific behavior to an updated [fd_]is_mount_point.  Besides
consolidation, this patch simplifies the reparse point patches
(updates in progress) since there's now only one routine that handles
both path-based and fd-based requests for file information.

Note: fstatat (used by is_mount_point) is not compatible with Mac OS X
prior to 10.10; however, this is already used by the current
fd_is_mount_point and if such compatibility is required at some point
then there are libraries available that provide this functionality (
https://www.winehq.org/pipermail/wine-devel/2021-August/194021.html ).

v2: is_mount_point now uses fstatat for both code paths in patch 1
instead of adding churn by waiting until patch 2

Best,
Erich
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