4266 remove Makefile*.shared nonsense in uts
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Approved by: Robert Mustacchi <rm@joyent.com>

6289535 build_cscope complains a bit on x86
6303550 xencrypt, xdecrypt no longer mangled
6316770 split the tree into open and closed trees
6321333 Install.sh is over-zealous looking for kmods

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