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ssh: move common Makefile boilerplate to a new ssh.mk

This moves SSHDIR and ssh_namespace.h handling to a common location,
and will simplify future work such as adding U2F support (D32509).

Reviewed by:	kevans
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32808

(cherry picked from commit 9d63429fa16352f58037ac2aa6ddc734b25e8331)

Git Hash:   3687d52b52f6a4cb739bdb0276ebe60d2b59df24
Git Author: emaste@FreeBSD.org
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