Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Add a makefle that recurses into the right architecture-specific
sub-directory. This to allow simpler logic outside of the csu
directory.

Obtained from: Juniper Networks, Inc.