Merge pull request #620 in SNORT/snort3 from tsc_clock to master

Merge pull request #620 in SNORT/snort3 from tsc_clock to master

Squashed commit of the following:

commit e2bd893a5333968fe1899d2e67b19b98e2a65668
Author: Russ Combs <rucombs@cisco.com>
Date:   Tue Sep 13 16:00:05 2016 -0400

    add cmake support for --enable-tsc-clock

commit 170d01c6bbf086b2ea08dc26c96619a18a5eaf4b
Author: Russ Combs <rucombs@cisco.com>
Date:   Mon Sep 12 22:40:10 2016 -0400

    add --enable-tsc-clock to build/use TSC register
    tweak link order so time methods are found
    clean up some fp_detect cruft
    update latency to use ticks during runtime
    fix stream profile stats parents
    remove unused cpuclock.h