upstream: Create and install sshd random relink kit.

../Makefile.inc and Makfile are concatenated for reuse, which hopefully won't
be too fragile, we'll see if we need a different approach. The resulting sshd
binary is tested with the new sshd -V option before installation.  As the
binary layout is now semi-unknown (meaning relative, fixed, and gadget
offsets are not precisely known), change the filesystem permissions to 511 to
prevent what I call "logged in BROP". I have ideas for improving this further
but this is a first step ok djm

OpenBSD-Commit-ID: 1e0a2692b7e20b126dda60bf04999d1d30d959d8

Author: [email protected]

.skipped-commit-ids

@@ -25,6 +25,7 @@ cc12a9029833d222043aecd252d654965c351a69	moduli-gen Makefile
 7ac6c252d2a5be8fbad4c66d9d35db507c9dac5b	moduli update
 6b52cd2b637f3d29ef543f0ce532a2bce6d86af5	makefile change
 f9a0726d957cf10692a231996a1f34e7f9cdfeb0	moduli update
+1e0a2692b7e20b126dda60bf04999d1d30d959d8	sshd relinking makefile changes
 
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