MFC r335189:

Added option to cluster-align the start of the root directory.

Obtained from: Android
Obtained from: https://android.googlesource.com/platform/system/core/+/052f27562154d175267999106bd6bf18fc8c363e
Obtained from: https://android.googlesource.com/platform/system/core/+/8218b6aae9cd4a19fa074a8a8203fe9275b35447
Differential Revision: https://reviews.freebsd.org/D15672

MFC r318355,318366: add -T (timestamp) option for reproducible builds

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Update $NetBSD$ ID

NetBSD mkfs_msdos.h rev 1.3 removed the no-endorsement clause from the
license block, which had already been done in the source I imported in
r289629.

newfs_msdos: use NetBSD's mkfs_msdos.h verbatim for makefs compatibility

Sponsored by: The FreeBSD Foundation

newfs_msdos: move mkfs_msdos to separate file for later use in makefs

Sponsored by: The FreeBSD Foundation